
Originally Posted by
vangogh
It's not so much for the value of the specific link. When Google first opened with their PageRank algorithm the idea was that a link would equal a vote. They were taking the concept from scientific papers, which are valued based on how often they get cited in other papers. More citations means more votes by fellow scientists who should be able to better judge the merits of the paper.
If you take the concept to social networks then people sharing and resharing content is a similar form of voting. It's letting people judge which content is best based on how often they share it with friends and the public. The thinking is an article that's shared by 1,000 people on a social network is more important than one shared by 2 people. At the very least it should be a signal for what people want.
With social they can not only look at how often something is being shared but who's sharing it. Something shared by a person with 10,000 followers might be deemed more important than something shared by someone with 10 followers. It's similar to how some links are more important than others.
Naturally none of these signals is perfect. Any signal on its own can be manipulated. Links have been manipulated as has social sharing as has everything else known to affect search results. Google's algorithms look at hundreds of different signals though, and they have ways to spot patterns of manipulation. The more signals the harder it becomes to manipulate the overall.
Social signals are yet another set of signals to look at. How much weight they have overall in the combined algorithms is unknown, but the signs are pointing toward it carrying more and more weight as the data gets better and now that it has its own network Google is going to get better and cleaner data to use and spot patterns.
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