Solution: Don't use public wi-fi. Especially when you have half a million followers on Twitter. Use only secure wi-fi. Better still, carry your own. Carry one of those phones.
Ashton Kutcher's Twitter account was similarly hacked at TED. TED! Think about that. Some millionaire hacker must have did that.
Looks Like FoodSpotting Rocked Austin
Ashton Kutcher's Twitter account hacked | ZDNet