How Does +1 affect a site’s performance in search engine results?

Content recommended by friends and acquaintances is often more relevant than content from strangers. Because +1’s from friends and contacts are a useful signal to Google when determining the relevance of your page to a user’s search query. This is just one of many signals Google may use to determine a page’s relevance and ranking. For +1's, as with any new ranking signal, Google will be studying carefully and learning how those signals affect search quality.

Kenny G 
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