Google's founders, in their original paper,[18] reported that the PageRank algorithm for a network consisting of 322 million links (in-edges and out-edges) converges to within a tolerable limit in 52 iterations. The convergence in a network of half the above size took approximately 45 iterations. Through this data, they concluded the algorithm can be scaled very well and that the scaling factor for extremely large networks would be roughly linear in {\displaystyle \log n} , where n is the size of the network.

nofollow is beyond a joke now. There is so much confusion (especially when other engines’ treatment is factored in), I don’t know how you expect a regular publisher to keep up. The expectation seems to have shifted from “Do it for humans and all else will follow” to “Hang on our every word, do what we say, if we change our minds then change everything” and nofollow lead the way. I could give other examples of this attitude (e.g. “We don’t follow JavaScript links so it’s ‘safe’ to use those for paid links”), but nofollow is surely the worst.
In early 2005, Google implemented a new value, "nofollow",[64] for the rel attribute of HTML link and anchor elements, so that website developers and bloggers can make links that Google will not consider for the purposes of PageRank—they are links that no longer constitute a "vote" in the PageRank system. The nofollow relationship was added in an attempt to help combat spamdexing.
Conversion rate optimization is still possibly one of the most underutilized but critical functions of digital marketing. Every element of digital marketing is useless without considering conversion rates. This goes for SEO, SEM, Social Media, Email, and Display. The power of your SEO rankings are only as good as your click through rates and your traffic is only valuable of your website and landing pages foster some type of “action.” Why spend all the time and energy driving traffic through multiple different channels if you are not willing to spend the time and energy on conversion optimization? Yet many brands and agencies still put less emphasis on this crucial piece of the puzzle.
It’s hard to believe that the Internet is now multiple decades old. Affiliate marketing has been around since the earliest days of online marketing. It’s a great solution for businesses that are risk-averse or don’t have the budget to spend on upfront marketing costs. Use affiliate marketing to build a new revenue stream for your ecommerce or B2B business.
A Web crawler may use PageRank as one of a number of importance metrics it uses to determine which URL to visit during a crawl of the web. One of the early working papers[56] that were used in the creation of Google is Efficient crawling through URL ordering,[57] which discusses the use of a number of different importance metrics to determine how deeply, and how much of a site Google will crawl. PageRank is presented as one of a number of these importance metrics, though there are others listed such as the number of inbound and outbound links for a URL, and the distance from the root directory on a site to the URL.

This pagerank theme is getting understood in simplistic ways, people are still concerning about pagerank all the time (talking about SEOs). I just use common sense, if I were the designer of a search engine, besides of using the regular structure of analysis, I would use artificial intelligence to determine many factors of the analysis. I think this is not just a matter of dividing by 10, is far more complex. I might be wrong, but I believe the use of the nofollow attribute is not a final decision of the website owner any more is more like an option given to the bot, either to accept or reject the link as valid vote. Perhaps regular links are not final decision of the webmaster too. I think Google is seeing websites human would do, the pages are not analyzed like a parser will do, I believe is more like a neural network, bit more complex. I believe this change make a little difference. People should stop worrying about pagerank and start building good content, the algorithm is far more complex to determine what is next step to reach top ten at Google. However nothing is impossible.

When Googlebot crawls a page, it should see the page the same way an average user does15. For optimal rendering and indexing, always allow Googlebot access to the JavaScript, CSS, and image files used by your website. If your site's robots.txt file disallows crawling of these assets, it directly harms how well our algorithms render and index your content. This can result in suboptimal rankings.
Let’s say that I want to link to some popular search results on my catalog or directory site – you know, to give a new user an alternative way of sampling the site. Of course, following Google’s advice, I have to “avoid allowing search result-like pages to be crawled”. Now, I happen to think that these pages are great for the new user, but I accept Google’s advice and block them using robots.txt.

The world is mobile today. Most people are searching on Google using a mobile device. The desktop version of a site might be difficult to view and use on a mobile device. As a result, having a mobile ready site is critical to your online presence. In fact, starting in late 2016, Google has begun experiments to primarily use the mobile version of a site's content41 for ranking, parsing structured data, and generating snippets.
In my example, if I am passing PR to a local eatery by having a do-follow link but there are 9 nofollow links on that page and I only had 10 points to begin with then that lowers the value I can give from my local foodie blog to that site. In that case would it actually be better to either disallow comments on that page or to disallow links associated with the comments on that page? I mean if my client is a food blogger (and some are) and they tell the restaurateur “when I write about you it will be good for your Google juice because I will place a link to you with my post” then they would really be diminishing the value they could give by having an increased number of links. Kinds of sucks for the blogger who wants a lot of comments, no?
Is very telling and an important thing to consider. Taking the model of a university paper on a particular subject as an example, you would expect the paper to cite (link to) other respected papers in the same field in order to demonstrate that it is couched in some authority. As PageRank is based on the citation model used in university work, it makes perfect sense to incorporate a “pages linked to” factor into the equation.
2. Was there really a need to make this change? I know all sites should be equally capable of being listed in search engines without esoteric methods playing a part. But does this really happen anyway (in search engines or life in general)? If you hire the best accountant you will probably pay less tax than the other guy. Is that really fair? Also, if nobody noticed the change for a year (I did have an inkling, but was totally and completely in denial) then does that mean the change didn’t have to be made in the first place? As said, we now have a situation where people will probably make bigger and more damaging changes to their site and structure, rather than add a little ‘nofollow’ to a few links.
Andy Beard, I was only talking about the nofollow attribute on individual links, not noindex/nofollow as a meta tag. But I’ll check that out. Some parts of Thesis I really like, and then there’s a few pieces that don’t quite give me the granularity I’d like. As far as page size, we can definitely crawl much more than 101KB these days. In my copious spare time I’ll chat with some folks about upping the number of links in that guideline.

So be wary. Ensure that you learn from the pros and don't get sucked into every offer that you see. Follow the reputable people online. It's easy to distinguish those that fill you with hype and those that are actually out there for your benefit. Look to add value along the way and you'll succeed. You might find it frustrating at the outset. Everyone does. But massive amounts of income await those that stick it out and see things through.

A: I pretty much let PageRank flow freely throughout my site, and I’d recommend that you do the same. I don’t add nofollow on my category or my archive pages. The only place I deliberately add a nofollow is on the link to my feed, because it’s not super-helpful to have RSS/Atom feeds in web search results. Even that’s not strictly necessary, because Google and other search engines do a good job of distinguishing feeds from regular web pages.
Assume a small universe of four web pages: A, B, C and D. Links from a page to itself are ignored. Multiple outbound links from one page to another page are treated as a single link. PageRank is initialized to the same value for all pages. In the original form of PageRank, the sum of PageRank over all pages was the total number of pages on the web at that time, so each page in this example would have an initial value of 1. However, later versions of PageRank, and the remainder of this section, assume a probability distribution between 0 and 1. Hence the initial value for each page in this example is 0.25.
In my view there is nothing wrong with saying ‘hey Google, these pages are not important from a search engine perspective, let me not give them so much weight’. Regardless of how Google now views these type of pages from a weight perspective, doing the above as a webmaster should be logical and encouraged. You have said this yourself at least a few times in the past.
Collaborative Environment: A collaborative environment can be set up between the organization, the technology service provider, and the digital agencies to optimize effort, resource sharing, reusability and communications.[36] Additionally, organizations are inviting their customers to help them better understand how to service them. This source of data is called User Generated Content. Much of this is acquired via company websites where the organization invites people to share ideas that are then evaluated by other users of the site. The most popular ideas are evaluated and implemented in some form. Using this method of acquiring data and developing new products can foster the organizations relationship with their customer as well as spawn ideas that would otherwise be overlooked. UGC is low-cost advertising as it is directly from the consumers and can save advertising costs for the organisation.
Our agency can provide both offensive and defensive ORM strategies as well as preventive ORM that includes developing new pages and social media profiles combined with consulting on continued content development. Our ORM team consists of experts from our SEO, Social Media, Content Marketing, and PR teams. At the end of the day, ORM is about getting involved in the online “conversations” and proactively addressing any potentially damaging content.

There is no secret that getting hiqh-quality backlinks is your website’s way to better ranking in Google. But how to differ good link from the bad one? Carefully choosing backlinks is a very tremulous and important task for everyone who wants to optimize their sites. There are a lot of different tools which can help you to check whether your backlinks are trustful and can bring your website value. 
When traffic is coming to your website or blog, nearly unfettered, it gives you the opportunity to test out a variety of marketing initiatives. However, without that traffic, you're forced to spend money on costly ads before really determining the effectiveness of your offers and uncovering your cost-per acquisition (CPA), two things which are at the core of scaling out any business online.
As an Internet marketing strategy, SEO considers how search engines work, the computer programmed algorithms which dictate search engine behavior, what people search for, the actual search terms or keywords typed into search engines, and which search engines are preferred by their targeted audience. Optimizing a website may involve editing its content, adding content, doing HTML, and associated coding to both increase its relevance to specific keywords and to remove barriers to the indexing activities of search engines. Promoting a site to increase the number of backlinks, or inbound links, is another SEO tactic. By May 2015, mobile search had surpassed desktop search.[3] In 2015, it was reported that Google is developing and promoting mobile search as a key feature within future products. In response, many brands are beginning to take a different approach to their Internet marketing strategies.[4]
If you decide to go into affiliate marketing, understand that you will need a lot of very targeted traffic if you want to make any real money. Those affiliate offers also need to provide a high commission amount to you on each sale. You also need to ensure that the returns or chargebacks for those products or services are low. The last thing you want to do is to sell a product or service that provides very little value and gets returned often.
Most people need to take a step back and understand where money is even coming from on the web. Sharpe says that, when asked, most individuals don't actually even know how money is being made on a high level. How does Facebook generate its revenues? How about Google? How do high-trafficked blogs become so popular and how do they generate money from all of that traffic? Is there one way or many?

Early versions of search algorithms relied on webmaster-provided information such as the keyword meta tag or index files in engines like ALIWEB. Meta tags provide a guide to each page's content. Using metadata to index pages was found to be less than reliable, however, because the webmaster's choice of keywords in the meta tag could potentially be an inaccurate representation of the site's actual content. Inaccurate, incomplete, and inconsistent data in meta tags could and did cause pages to rank for irrelevant searches.[10][dubious – discuss] Web content providers also manipulated some attributes within the HTML source of a page in an attempt to rank well in search engines.[11] By 1997, search engine designers recognized that webmasters were making efforts to rank well in their search engine, and that some webmasters were even manipulating their rankings in search results by stuffing pages with excessive or irrelevant keywords. Early search engines, such as Altavista and Infoseek, adjusted their algorithms to prevent webmasters from manipulating rankings.[12]
In my example, if I am passing PR to a local eatery by having a do-follow link but there are 9 nofollow links on that page and I only had 10 points to begin with then that lowers the value I can give from my local foodie blog to that site. In that case would it actually be better to either disallow comments on that page or to disallow links associated with the comments on that page? I mean if my client is a food blogger (and some are) and they tell the restaurateur “when I write about you it will be good for your Google juice because I will place a link to you with my post” then they would really be diminishing the value they could give by having an increased number of links. Kinds of sucks for the blogger who wants a lot of comments, no?
There are things like solo ads that you can buy or join up with JV partners to help sell whatever it is that you're peddling. But at the outset, you're going to find it difficult to succeed in the internet marketing field. Ensure that you learn the right skills along the way so that you can become an effective online marketer. It doesn't matter how slow you go, as long as you don't stop, you'll reach your goals.
What is a useful place in search results? Ideally, you need to be in the top three search results returned. More than 70% of searches are resolved in these three results, while 90% are resolved on the first page of results. So, if you’re not in the top three, you’re going to find you’re missing out on the majority of potential business—and if you’re not on the first page, you’re going to miss out on nearly all potential business.

PageRank is only a score that represents the importance of a page, as Google estimates it (By the way, that estimate of importance is considered to be Google’s opinion and protected in the US by the First Amendment. When Google was once sued over altering PageRank scores for some sites, a US court ruled: “PageRanks are opinions — opinions of the significance of particular Web sites as they correspond to a search query….the court concludes Google’s PageRanks are entitled to full constitutional protection.)
This isn't about off-the-shelf solutions. You need to really convey something illustrious and beautiful, then fill it with incredible MVP content. Over time, this will become a thriving hotbed of activity for you, where people will come by and check-in repeatedly to see what you're talking about and what value you're delivering. Keep in mind that this won't happen quickly. It will take years. Yes, I said years.
Digital marketing's development since the 1990s and 2000s has changed the way brands and businesses use technology for marketing.[2] As digital platforms are increasingly incorporated into marketing plans and everyday life,[3] and as people use digital devices instead of visiting physical shops,[4][5] digital marketing campaigns are becoming more prevalent and efficient.
Yes, the more links on a page the smaller the amount of page rank it can pass on to each, but that was as it was before. With regard to what happens to the ‘missing’ page rank, it seems that if this is the case all over the Internet, and it will be, the total amount of page rank flow is reduced the same all over so you don’t need as much page rank flow to your good links to maintain relative position.
What are "backlinks"? Backlinks are links that are directed towards your website. Also knows as Inbound links (IBL's). The number of backlinks is an indication of the popularity or importance of that website. Backlinks are important for SEO because some search engines, especially Google, will give more credit to websites that have a good number of quality backlinks, and consider those websites more relevant than others in their results pages for a search query.
PageRank was influenced by citation analysis, early developed by Eugene Garfield in the 1950s at the University of Pennsylvania, and by Hyper Search, developed by Massimo Marchiori at the University of Padua. In the same year PageRank was introduced (1998), Jon Kleinberg published his work on HITS. Google's founders cite Garfield, Marchiori, and Kleinberg in their original papers.[5][18]
This will help you replicate their best backlinks and better understand what methods they are using to promote their website. If they are getting links through guest blogging, try to become a guest author on the same websites. If most of their links come from blog reviews, get in touch with those bloggers and offer them a trial to test your tool. Eventually, they might write a review about it.
What that means to us is that we can just go ahead and calculate a page’s PR without knowing the final value of the PR of the other pages. That seems strange but, basically, each time we run the calculation we’re getting a closer estimate of the final value. So all we need to do is remember the each value we calculate and repeat the calculations lots of times until the numbers stop changing much.
Another example when the “nofollow" attribute can come handy are widget links. If you are using a third party's widget to enrich the experience of your site and engage users, check if it contains any links that you did not intend to place on your site along with the widget. Some widgets may add links to your site which are not your editorial choice and contain anchor text that you as a webmaster may not control. If removing such unwanted links from the widget is not possible, you can always disable them with “nofollow" attribute. If you create a widget for functionality or content that you provide, make sure to include the nofollow on links in the default code snippet.

An Internet marketing campaign is not an isolated, one-off proposal. Any company that plans on using it once is certain to continue to use it. An individual who is knowledgeable about all aspects of an Internet marketing campaign and who has strong interpersonal skills is well-suited to maintain an ongoing managerial role on a dedicated marketing team. 

nofollow is beyond a joke now. There is so much confusion (especially when other engines’ treatment is factored in), I don’t know how you expect a regular publisher to keep up. The expectation seems to have shifted from “Do it for humans and all else will follow” to “Hang on our every word, do what we say, if we change our minds then change everything” and nofollow lead the way. I could give other examples of this attitude (e.g. “We don’t follow JavaScript links so it’s ’safe’ to use those for paid links”), but nofollow is surely the worst.

Thank you, Brian, for this definitive guide. I have already signed up for Haro and have plans to implement some of your strategies. My blog is related to providing digital marketing tutorials for beginners and hence can be in your niche as well. This is so good. I highly recommend all my team members in my company to read your blog everytime you published new content. 537 comments in this post within a day, you are a master of this. A great influence in digital marketing space.

For example, it makes a much bigger difference to make sure that people (and bots) can reach the pages on your site by clicking links than it ever did to sculpt PageRank. If you run an e-commerce site, another example of good site architecture would be putting products front-and-center on your web site vs. burying them deep within your site so that visitors and search engines have to click on many links to get to your products.
The paper’s authors noted that AltaVista (on the right) returned a rather random assortment of search results–rather obscure optical physics department of the University of Oregon, the campus networking group at Carnegie Mellon, Wesleyan’s computer science group, and then a page for one of the campuses of a Japanese university. Interestingly, none of the first six results return the homepage of a website
9. Troubleshooting and adjustment. In your first few years as a search optimizer, you’ll almost certainly run into the same problems and challenges everyone else does; your rankings will plateau, you’ll find duplicate content on your site, and you’ll probably see significant ranking volatility. You’ll need to know how to diagnose and address these problems if you don’t want them to bring down the effectiveness of your campaign.
We regard a small web consisting of three pages A, B and C, whereby page A links to the pages B and C, page B links to page C and page C links to page A. According to Page and Brin, the damping factor d is usually set to 0.85, but to keep the calculation simple we set it to 0.5. The exact value of the damping factor d admittedly has effects on PageRank, but it does not influence the fundamental principles of PageRank. So, we get the following equations for the PageRank calculation:

The best strategy to get backlinks is to create great content and let other people promote your content. However, to get started, you can create your own links to content on your social media platform, ask your friends to share your content on their websites and social media, and if you can find questions in forums that your content answers, you can always post it there.
Chris_D, great question. If you have a single product page that can have multiple urls with slightly different parameters, that’s a great time to use a rel=canonical meta tag. You can use rel=canonical for pages with session IDs in a similar fashion. What rel=canonical lets you do is say “this page X on my host is kinda of ugly or otherwise isn’t the best version of this page. Use url Y as the preferred version of my page instead.” You can read about rel=canonical at http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=139394. Bear in mind that if you can make your site work without session IDs or make it so that you don’t have multiple “aliases” for the same page, that’s even better because it solves the problem at the root.

Matt, in almost every example you have given about “employing great content” to receive links naturally, you use blogs as an example. What about people that do not run blog sites (the vast majority of sites!), for example an E-Com site selling stationary? How would you employ “great content” on a site that essentially sells a boring product? Is it fair that companies that sell uninteresting products or services should be outranked by huge sites like Amazon that have millions to spend on marketing because they cant attract links naturally?
Getting unique and authoritative links is crucial for higher ranking in the SERPs and improving your SEO. Google's algorithm on evaluation of links evolved in recent years creating a more challenging process now to get high quality backlinks. External links still matter and aren’t obsolete, so start working on strategies to get valuable backlinks to improve your search visibility.
I have a question. My site is in download/free resources niche, and I’m having some troubles figuring out link building opportunities. Most of the webmasters from other websites in this niche don’t really actively respond to my email. I guess it’s because this is a niche that people often build a high traffic website and leave it there as a passive income. Do you have any suggestion?
Assume a small universe of four web pages: A, B, C and D. Links from a page to itself are ignored. Multiple outbound links from one page to another page are treated as a single link. PageRank is initialized to the same value for all pages. In the original form of PageRank, the sum of PageRank over all pages was the total number of pages on the web at that time, so each page in this example would have an initial value of 1. However, later versions of PageRank, and the remainder of this section, assume a probability distribution between 0 and 1. Hence the initial value for each page in this example is 0.25.
Halfdeck; Don’t you think the big problem is that Google is giving too much information to the industry? I stated a long time ago this fact, wondering why they wish to constantly hand out more information when they should have known the industry would try their best to exploit anyway. Not only that, but wanting more and more no matter how much Google hands out is something that is very clear as well. You just stated you want “more detail”. Why? I’m thinking too much detail handed out over the years is Google’s biggest problem right now. Considering the total majority of websites on the internet don’t know what a nofollow attribute is anyway, what exactly is Google gaining by giving up parts of their algo to the SEO industry? Big mistake. They should actually just shut up.
Another way to get sites to link back to something valuable on your site is by offering a free tool. A free tool could be a basic tool (like an auto loan calculator) or a scaled down version of a paid tool (like Alexa’s Site Overview and Audience Overlap tools). If the tools are valuable enough, others will link to them in their content. Plus, on free versions of paid tools, you can add call-to-actions to sign up for the full product/service which drives acquisition in addition to awareness.
Affiliate marketing is the art of marketing products, services or information for others. It doesn't require that you ever house or warehouse a single thing. But it does require that you have an audience to market those things to online. Without that audience, whether it's through search engines like Google or social media channels like Facebook, you'll find a difficult time with affiliate marketing.
Thanks for the clarification, Matt. We were just wondering today when we would hear from you on the matter since it had been a couple of weeks since SMX. I think we’d all be interested to know the extent to which linking to “trusted sites,” helps PageRank. Does it really mitigate the losses incurred by increasing the number of links? I ask because it seems pretty conclusive that the total number of outbound links is now the deciding metric for passing PageRank and not the number of DoFollow links. Any thoughts from you or others?
8. Technical SEO. Technical SEO is one of the most intimidating portions of the SEO knowledge base, but it’s an essential one. Don’t let the name scare you; the most technical elements of SEO can be learned even if you don’t have any programming or website development experience. For example, you can easily learn how to update and replace your site’s robots.txt file, and with the help of an online template, you should be able to put together your sitemap efficiently.

Brian, you are such an inspiration. I wonder how do you get all these hacks and then publish them for all of us. I have been reading your stuff from quite a time now, but I have a problem. Every time I read something you post I feel overwhelmed but I haven’t been really able to generate any fruitful results on any of my sites. I just don’t know where to start. Imagine I don’t even have an email list.
Web design is a very technical field that requires high literacy in many different kinds of software, including image editing and website architecture programs. A designer should be comfortable with computer “languages” like HTML and stay up to date on new technological developments. The designer is also an artist, so he or she should also have a firm grasp on aesthetics, visual continuity, and image composition.

Gotta love Google. They turn the entire SEO/webmaster world on its head with an announcement of a new attribute in 2005. We all go out and make changes to our sites to take advantage of this new algorithm change that is said to benefit out sites. And then 2 years later, they change their mind and rewrite the code – and dont bother to tell anyone. And then a YEAR LATER, they make an announcement about it and defend the change by saying “the change has been in effect for over a year, so if you haven’t noticed obviously it isnt that big a deal”
As an internationally recognized Search Engine Marketing agency, we have the team, technology, and skills to manage large budget PPC campaigns with thousands of keywords. We have the ability to manage enterprise level accounts in multiple languages. IMI is also partner with Marin Software to provide our clients with the best possible advertising management platform, reporting dashboard, attribution modeling, and reporting.

Disclaimer: Google™ search engine and PageRank™ algorithm are the trademarks of Google Inc. CheckPageRank.net is not affiliated with Google Inc., but provides publicly available information about pagerank values of websites. We provide our services on "as is" and "as available" basis and we do not provide any guarantees regarding this service stability and/or availability.

It helps to improve your ranking for certain keywords. If we want this article to rank for the term ’SEO basics’ then we can begin linking to it from other posts using variations of similar anchor text. This tells Google that this post is relevant to people searching for ‘SEO basics’. Some experts recommend varying your anchor text pointing to the same page as Google may see multiple identical uses as ‘suspicious’.
PageRank was developed by Google founders Larry Page and Sergey Brin at Stanford. In fact the name. PageRank is a likely play on Larry Page's name. At the time that Page and Brin met, early search engines typically linked to pages that had the highest keyword density, which meant people could game the system by repeating the same phrase over and over to attract higher search page results. Sometimes web designers would even put hidden text on pages to repeat phrases.  
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