Peter Cashmore seems to know:
London, England (CNN) — As 2009 draws to a close, with Twitter undoubtedly this year’s media darling and Facebook continuing on its path to global domination, you may wonder which social-media service will become tech’s poster boy in 2010.
Among the Web’s early adopter set, the answer is nearly unanimous: Foursquare.
While the technology landscape is ever-changing, I’d argue that Foursquare already has aligned itself to become next year’s mainstream hit.
Cubiyanqui 