Google, Facebook and Twitter have unveiled the most-shared memes and hashtags of 2012. Facebook's top memes were entertainment-related -- think "Linsanity" and "Gangnam style" -- while Google+ cemented its reputation as an "ultra-nerdy social network" by including tags relating to developer conferences and tech-industry events on its top-10 list, Ryan Tate writes.

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CNN, Wired.com

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