Social media may seem a strange thing to give thanks for, but not if you're the Cleveland restaurateur who recovered a stolen food truck after posting a despairing tweet, or the hearing-impaired woman who uses Twitter as a kind of closed-captioning service for public meetings. Twitter officials say they're "pretty humbled" by the success stories they hear. "We see really amazing things happen all the time, whether it's entire political movements abroad or one stranger helping another stranger," Twitters' Rachael Horowitz says.