(Every Time Someone Uses Facebook t-shirt now on sale at the NeatoShop)
James Wood of Minneapolis, Minnesota noticed that someone had broken into his house while he was away. He called the police. While waiting for them, he noticed that someone--presumably the thief--had logged into Facebook on his computer.
Wood updated the suspect's status and asked anyone reading to provide information about him. Commenters promptly contributed information about the owner the account, who later contacted Wood and asked him for some personal items that he had accidentally left in Wood's home while burglarizing it.
Wood agreed and called the police when the suspect showed up. Police arrested the man and charged him with second degree burglary.
-via Geekologie