Search vs. Social Media: How Audience ‘Intent’ Can Affect Content Marketing Performance
Search vs. Social: The 50 Shades of Gray in Online Information Retrieval | Search Engine Watch
Social Referrals Up 111% and Search Traffic Down 6% [Report]
Social vs Search infographic
Mahalo.com: Human-powered Search
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socialmeter
PreFound - search what people have already found
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Squidoo