Do it with a really good, preferably really right-wing flounce.
Something like "Kill all the muslims/Jews/gays/blacks" and when someone objects, answer with "WHY AREN'T I ALLOWED MY OWN OPINIONS?!?!?!?!!!" (preferably with terrible spelling), followed with a couple of updates about how SOME PEOPLE don't like you expressing YOUR OWN VIEWS or similar, and then how you've been crying all night, and then how you're going to delete, "reel frendz no who n ware i am".

THEN delete.

Please.
( Je suis un vagabond is an unfunny, up your own arse middle class knob, Wed 14 Jan 2015, 15:18, 1 reply, 10 years ago)

Better idea: -
Change your name to that of someone you don't like with a lot of mutual friends, and remove them as a friend. Delete all personal information and remove all of your pictures.

Post the IS flag as your new profile picture and insert some of their personal photo's in the albums, and post lots of jihadist stuff about how you intend to kill westerners.
( Muns, Wed 14 Jan 2015, 15:28, Reply)

Extra effective just before that person goes on holiday to Turkey.

( Muns, Wed 14 Jan 2015, 15:29, Reply)