UPDATE: According to a Google Analytics webinar on Aug 29, 2012 (at the 25:48 mark), there are roughly 400 social networks. So, even as obscure as some of the networks are in my list are, there are roughly 150 more! UPDATE: I added 28 more social networks to the list on Feb 11, 2014, after comparing my list with this one published by LunaMetrics, bringing my total to 276 networks.

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