Toronto: Bike thief followed by earnest good Samaritan, who snaps an iPhone picture. Theft reported to police; to help find witnesses, photo posted to the internet.
New York: Bike thief gets ass beat by enraged bike owner and friends. Ass beaters, proud of themselves, record the beating; video posted to the internet.
(Tip of the hat to commenter tapesonthefloor at Torontoist.)