Okay, so no one ever thought that the Internet would or could be used to do only good.
But what do you think about this? A site dedicated to aggregating tweets from people who have just tweeted about leaving their homes, proposing itself as an information source for would be robbers to move in for a safe strike. Kinda effed up, no? Or, maybe this can be seen as raising social awareness about just how senseless it is to tweet your location for no reason at all. Go to the site and click on "why" to read their reasoning. Either way, I'm afraid it's hard to deny the ingenuity.