It's called Social Seating. Don't want to sit next to a 6 year old? Looking for that single serving friend? Both Malaysia Airlines and Royal Dutch Airlines have just launched MHbuddy, in which users can check in via Facebook and select their seats. During seat selection, they are able to view the seats of other passangers on the same flight. Fun on paper? Yes! A creepy stalker situation waiting to happen? Also yes.
CNN article found here.