This must be one of the most controversial attributes ever. I participate in photographic communities. The textual content there is quite sparse, as it is a visual medium, with only basic descriptions. However, the community is very active and the participants leave a lot of meaningful comments. Now, with the “nofollow” used everywhere the photographic community is punishing itself for being active and interactive without knowing it. WordPress and Pixelpost now have “nofollow” built in almost on any list of links (blog-roll, comments etc). The plug-in and theme developers for these platforms followed suit and yes, you’ve guessed it – added “nofollow” almost on every link. So, every time I leave a comment without being an anonymous coward or if some one likes my blog and links to it in their blog-roll than I’m or they are diluting the rank of my blog? Does it mean for my own good I should stop participating in the community? Should I visit hundreds of blogs I visited in last three years and ask the owners to remove my comments and remove my site from their blog-roll to stop my PageRank from free falling?

Muratos – I’ve never nofollowed Amazon affiliate links on the theory that search engines probably recognize them for what they are anyway. I have a blog, though, that gets organic traffic from those Amazon products simply because people are looking for “Copenhagen ring DVD” and I hard-code the product names, musicians’ names, etc. on the page rather than use Amazon’s sexier links in iframes, etc.

To prevent users from linking to one version of a URL and others linking to a different version (this could split the reputation of that content between the URLs), focus on using and referring to one URL in the structure and internal linking of your pages. If you do find that people are accessing the same content through multiple URLs, setting up a 301 redirect32 from non-preferred URLs to the dominant URL is a good solution for this. You may also use canonical URL or use the rel="canonical"33 link element if you cannot redirect.
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Here’s my take on the whole pagerank sculpting situation. As I understand it, the basic idea is that you can increase your rankings in Google by channeling the page rank of your pages to the pages you want ranked. This used be done with the use of the ‘no folow’ tag. That said, things have changed, and Google has come out and said that the way ‘no follow’ use to work has changed. In short, using ‘no follow’ to channel that page rank juice is no longer as effective as it once was.
Search engine optimization is a key part of online marketing because search is one of the primary ways that users navigate the web. In 2014, over 2.5 trillion searches were conducted worldwide across search engines such as Google, Bing, Yahoo, Baidu, and Yandex. For most websites, traffic that comes from search engines (known as "natural" or "organic" traffic) accounts for a large portion of their total traffic.

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