One team captain has a chance to break a gold-free streak dating back to 1904
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Kerron Clement, men's track and field
Clement may become a household name not for his abilities, but for his tweeting. After a lengthy flight, he and his teammates found themselves stuck on a bus. When he tweeted, “Um, so we’ve been lost on the road for 4hrs. Not a good first impression London," the message went viral. Clement, who'll be competing in the 400m hurdles, has made an effort to send happier tweets since, but he doesn't really have regrets about his comment -- his hope is that it inspired some improvements in the London transit system.