Link Popularity
The search engines have a number of different ways to measure how popular a web site is. Most of these involve an analysis of the number of links to a site. The more links to a web site, the more popular it is thought to be and the higher it should rank in the search results. However, the search engines have become more complicated and the link juice passed by each link is not the same. Some links pass more link juice than others do. The search engine, Google has what is called Pagerank (PR) that it gives each page as a sign of the popularity of that page. PR is only update it every 2-3 or so months, so its old data (see dates of PR updates). The PR also an overall link score and does not indicate the link juice that a links passes. Microsoft have Bing’s Page Score, which is a number that they give a page. It is not clear what it is that makes up the score. An SEO company, SEOMOZ have developed mozRank and mozTrust. The mozRank is similar to PR and is not affected by the penalties that Google apply, so can give you a different look at page popularity. The mozTrust which is a measure of the domain authority of a web site. Links from authority pages are the most sort after as they pass me link juice, so this is also a useful measure to understand.
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