What happens to your facebook or twitter if you die? ?

[Cupcakelover]

just random i mean it doesnt know your dead so does just go inactive if you dont go on it for like a year or something?

[Hannah Geiser]

No it just never updates again.

[BattlefieldFan123]

god deletes your facebook account

[awake85]

your friends update it for you

[TM4ever]

it wont deleted till u delete it or site orgnisers delete non actives after 5 10 years

[...]

As far as I know nothing happens. I have a couple friends on my facebook who have passed on and their facebook accounts are still there. People post on them and say how much they miss them ect even now. I'm not 100% sure on this, but my friend's sister died (I was FB friends with her) and her account was memorialized by her friend about a year after she passed on. I don't know how this changes the account/layout though.
I know nothing about twitter though.

[Jewels]

It doesn't deactivate on its own.. how would Facebook know if you died?

[Thanos Paravantis]

I don't think that something will happen. You just wont login!

[Smokies Hiker]

Your family can choose to leave the accounts in place for friends to use, or by proving that you are deceased to either company, the family can have the account closed and taken down.

[Brandy]

Unless you close the account yourself it will just stay open indefinitely. Loads of people have twitter accounts that they haven't used for several months.