The theory goes that if hundreds or thousands of other websites link to you, your site must be popular, and thus, have value. If those links come from very popular and important (and thus, trustworthy) websites, their power is multiplied to even greater degrees. Links from sites like NYTimes.com, Yale.edu, Whitehouse.gov, and others carry with them inherent trust that search engines then use to boost your ranking position. If, on the other hand, the links that point to you are from low-quality, interlinked sites or automated garbage domains (aka link farms), search engines have systems in place to discount the value of those links.

The most well-known system for ranking sites based on link data is the simplistic formula developed by Google’s founders – PageRank. PageRank, which relies on a mathematical formula (based around finding a given document in a random pattern of clicking on links), is described by Google in their technology section:

PageRank is, in essence, a rough system for estimating the value of a given link based on the links that point to the host page. Since PageRank’s inception in the late ’90s, more subtle and sophisticated link analysis systems have taken the place of PageRank. Thus, in the modern era of SEO, the PageRank measurement in Google’s toolbar, directory, or through sites that query the service is of limited value. Pages with PR8 can be found ranked 20-30 positions below pages with a PR3 or PR4. In addition, the toolbar numbers are updated only every 3-6 months by Google, making the values even less useful. Rather than focusing on PageRank, it’s important to think holistically about a link’s worth.

The most important factors search engines look at when attempting to value a link:

• The Anchor Text of Link - Anchor text describes the visible characters and words that hyperlink to another document or location on the web. For example, in the phrase “CNN is a good source of news, but I actually prefer the BBC’s take on events,” two unique pieces of anchor text exist – “CNN” is the anchor text pointing to http://www.cnn.com, while “the BBC’s take on events” points to http://news.bbc.co.uk . Search engines use this text to help them determine the subject matter of the linked-to document. In the example above, the links would tell the search engine that when users search for “CNN”, http://www.cnn.com is a relevant site for the term “CNN” and that http://news.bbc.co.uk  is relevant to “the BBC’s take on events”. If hundreds or thousands of sites think that a particular page is relevant for a given set of terms, that page can manage to rank well even if the terms NEVER appear in the text itself (for example, see the BBC’s explanation of why Google ranks certain pages for the term “Miserable Failure“).

• Global Popularity of the Site – More popular sites, as denoted by the number and power of the links pointing to them, provide more powerful links. Thus, while a link from SEOmoz may be a valuable vote for a site, a link from bbc.co.uk or cnn.com carries far more weight. This is one area where PageRank (assuming it was accurate) could be a good measure, as it’s designed to calculate global popularity.

• Popularity of Site in Relevant Communities – In the example above, the weight or power of a site’s vote is based on its raw popularity across the web. As search engines became more sophisticated and granular in their approach to link data, they acknowledged the existence of “topical communities”; sites on the same subject that often interlink with one another, referencing documents and providing unique data on a particular topic. Sites in these communities provide more value when they link to a site/page on a relevant subject rather than a site that is largely irrelevant to their topic.

• Text Directly Surrounding the Link – Search engines have been noted to weight the text directly surrounding a link with greater important and relevant than the other text on the page. Thus, a link from inside an on-topic paragraph may carry greater weight than a link in the sidebar or footer.

• Subject Matter of the Linking Page – The topical relationship between the subject of a given page and the sites/pages linked to on it may also factor into the value a search engine assigns to that link. Thus, it will be more valuable to have links from pages that are related to the site/page’s subject matter than those that have little to do with the topic.

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=> We find blog posts, from which a link will help you in increasing your SERPs and gaining traffic.

=>We go to these blog posts, “read them and make a relevant comment on them”. While commenting, we enter your linkback in the “Website” field.

=> If the comment is approved (of which the chances are really high), you will get a quality, one-way linkback to your website. The anchor text of the link will be what we entered in the “Name” field.

=> This is yet another way to increase your backlinks, and boost your rankings in the search engines.

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