Social Media and Search

Much user-generated content is hosted on social media Web sites, which commonly allow users to form communities based on shared interests, and to associate tags, reviews, recommendations, and comments with content.  These metadata are invaluable in helping assess the highly variable quality of content that end users are creating. Visitors to these sites often seek not just the content itself, but also an understanding of the individuals who posted it. Furthermore, they might visit a site without any particular goal or informational need, but rather based on the simple desire to “get an update” or “be entertained” during their spare time.

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Vulnerability to spam

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Short lifespan

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Locality of interest

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Access control

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