As an avid reader of [insert their site name], I love reading anything you write about, such as [insert article on their website], and anything you link out to. Sadly, I couldn’t find the article you were trying to link to, but I did happen to find another good webpage on the same topic: [insert url to webpage that you are building links to]. You should check it out, and if you like it, you probably want to switch the links.

For Search Engines, backlinks help to determine the page’s importance and value (i.e. authority). Historically, the quantity of backlinks was an indicator of a page’s popularity.  Today, due to the way backlinks are evaluated based on different industry-related ranking factors, it is less quantity focused and more about the quality of sites from which the links are coming.
Many blogging software packages automatically nofollow user comments, but those that don't can most likely be manually edited to do this. This advice also goes for other areas of your site that may involve user-generated content, such as guest books, forums, shout-boards, referrer listings, etc. If you're willing to vouch for links added by third parties (for example, if a commenter is trusted on your site), then there's no need to use nofollow on links; however, linking to sites that Google considers spammy can affect the reputation of your own site. The Webmaster Help Center has more tips on avoiding comment spam39, for example by using CAPTCHAs and turning on comment moderation.
Many years ago, low-quality SEO firms loved to abuse the comments sections of blogs, forums, and news sites as a way to build backlinks for clients. This approach is pretty ineffective these days, as most reputable sites that are worth having backlinks on have responded to such abuse by making all such links 'nofollow.' While sites like Quora and industry-specific forums are great for sharing your expertise and raising your visiblity, you're not going to get any SEO value from them.
A: I wouldn’t recommend it, because it isn’t the most effective way to utilize your PageRank. In general, I would let PageRank flow freely within your site. The notion of “PageRank sculpting” has always been a second- or third-order recommendation for us. I would recommend the first-order things to pay attention to are 1) making great content that will attract links in the first place, and 2) choosing a site architecture that makes your site usable/crawlable for humans and search engines alike.
While ordinary users were not that interested in pages' scores, SEOs of a different caliber felt that this was a great opportunity to make a difference for their customers. This obsession of SEOs with PageRank made everyone feel that this ranking signal is more or less the only important one. In spite of the fact that pages with a lower PR score can beat those with a higher score! What did we receive then, as a result?

Page Rank