I'm surprised I hadn't heard about this since it's a local story...
18-year-old in TX is "talking trash" with friends on Facebook.
In response to being called crazy, he says, "I'm *** in the head alright, I think I'ma shoot up a kindergarten." Two similar comments follow.
Unknown person in CANADA sees his comments, views his location as listed on Facebook, and reports him to local police in TX.
TX police find that address listed on his Driver's License is within 100 yards of an elementary school in Austin. They proceed to find him at work (in San Antonio) and arrest him. They search his home (in New Braunfels) and find no evidence that he is a danger to anyone.
Nonetheless, his bail is set at half a million dollars and he faces up to 10 years in prison if convicted.
He spends 4 months in jail until an anonymous person posts his bail. During that time, he is sexually assulted and then put on suicide watch due to his depression.
At this point, if he agrees to plead guilty to a felony, he can serve 10 years probation instead.http://www.houstonpress.com/2014-02-13/news/justin-carter-facebook/
This happened a year ago and the charges still haven't been dropped.
Yet another reason to keep your family away from Facebook? If this guy had been anonymous, they might not have bothered to track him down, but he made it all too easy for them.