You can’t visit a webpage these days without it begging for a compliment: Like us! Share us! Follow us! Social media promotion is one big reason why–just look at The Washington Post , for example, which seems intent on replacing its brand name with the Facebook logo, and barely refrained from slapping a “Like” badge on everything from its user agreement policy to its copyright acknowledgements. But viral promotion isn’t the only reason. Increasingly, social media is impacting search-engine rankings.
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Bing’s Social Search Won’t Always Rely On Facebook "Likes"