Summer Olympics 2012: Best Athlete Tweets, Twitpics and Instagrams from Day 13

On Day 13 Serena Williams graces us with her social media presence. She pulls rank by posting pics with some of the highest-profile athletes in London. Of course, the most electrifying man in track and field is represented. Usain Bolt is a superhero. The Marvel cartoon strip should roll before every one of his races.

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