http://mashable.com/2012/07/12/facebook-scanning-chats/
First, I must say is you're pretty stupid if you're going to discuss real criminal plans on the web. Of course it would be a whole nother story if you made all these plans and no one showed up over and over again. That's kinda like knowing you're on a hit list, you book a flight, and don't go on the plane to see if they blow it up?
No, not quite, but still. . .