Google’s core algorithm is based on measuring links coming into a page. Because of this, link-building is part of any good search engine optimization campaign. In the span of a month, incoming links to one or more pages of a website might jump by hundreds or thousands. Some of those links might be useful in Google’s eyes and some might be useless. The question is, how does it sort which is which?

Google collects a lot of data when it examines a page and the links directed on to or off of that page. When Google mentions they are using “historic data” to determine the value of links directed to your page, they are referring to a number of factors. It knows how long the page has been online, or at least when it first became aware of said page. It also knows how long pages linked to have been online. It knows how often links get clicked and also knows which computer, (and in many cases, exactly who) is clicking the link and where that clicking is coming from.

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