One is based on how many links a university's website receives from other highly rated institutions.

ECONOMIST: University rankings

The search giant does this with a black box of variables that includes how many meaningful links are pointing to a given Web page.

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Finally the new tool reveals a list of the most Tweeted links or stories from a website and how many clicks those links received.

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You see how many recipients received your email, how many and who actually viewed your video, what links were clicked and how many emails were bounced back.

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Because Google ranks sites in its search results based on how many other sites link to them, many high-ranking sites will sell links to low-ranking sites, earning cash in return for boosting the low-ranking site in search results.

FORBES: Magazine Article

They judged a listed site's prominence by how many other Web sites valued it enough to have links to it.

FORBES: Companies & Strategies

It tells us how many people are reading each article on the site, how far down the article people are reading, which Forbes links they click on, etc.

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