Actually, they might be mimes, other than the whole talking thing.
My old man pointed out how people were grabbing car GPS’ from events, pressing the ‘Home’ button and then breaking into houses figuring they had a couple hours. This was the article that sparked the notion that people are actually tweeting that they’re away from home. The article will point you to this site in case you’re thinking of taking up this tactic (kidding, of course). Be careful what you tweet.