I still have doubts about Twitter*, though...

Maybe Facebook has some legitimate value after all.

So, drunk guy steals woman's bag and wallet froma Philadelphia bar (the bag has a chihuahua in it too); woman gets his name from the barman, uses Facebook and Google to a) identify him and b) find his address. Charms her way past apartment building security, confronts idiot thief, rescues dog and departs triumphant, saving the police time and money and effort. No charges are pressed and for once everything ends well.All thanks to the wonders of Facebook.

It's quite a caper and worth reading in full.

Bonus, as KMW says, the perp asked if he could be Facebook friends with the victim the next day. [More]

*Besides, the thought of confining myself to 140 characters makes my blood run cold.