Popular social network sites including MySpace and Facebook are changing the human fabric of the Internet and have the potential to pay off big for investors but -- given their youthful user base -- they are unusually vulnerable to the next new fad. As quickly as users flock to one trendy Internet site they can just as quickly move on to another with no advance warning according to Wharton faculty and Internet analysts who offer some ideas on how these new sites can both increase user loyalty and generate revenues.
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