Small, highly focused social networks seldom achieve mass-market success in their own right, SmartBrief's Jesse Stanchak writes, but they offer valuable clues as to the directions in which social media as a whole is heading. You probably won't hear much about niche services such as Historypin and World of Fourcraft, but the ideas and technologies underpinning these and similar sites will inevitably be assimilated and adopted by the major social networks, Stanchak writes.

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