Mafia hitman Pasquale Manfredi was nabbed by Italian police thanks to his love of Facebook.
Manfredi is wanted for a number of drug trafficking charges and
multiple murders, including an assassination of rival mobster in 2002,
whom he apparently mistook for a tank and sent him to the happy hunting
grounds using an RPG.
Oddly enough, despite his impressive criminal track record, Manfredi
maintained a Facebook profile and had more than 200 friends. He
apparently used a prepaid USB modem to access the net, which allowed
investigators to track him down.
Although he liked to refer to himself as Scarface, he pulled an Escobar
when the coppers came knocking. He climbed to the roof and tried to get
away, but eventually gave himself up.
More
here.