An anonymous reader writes: People hungry for social interaction on the web currently have a near boundless choice for their communal appetites, but this article in Social Computing Magazine notes that is increasingly difficult to launch a new one and achieve any real traction with it. The article chooses Virb as an example of one that's waned after a momentary spike, while Facebook continues its meteoric rise, causing recent speculation that it may even replace email. What makes FB a potential killer app and Virb an also-ran – what's the present consensus on the secret sauce for a globally successful social network?
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