Originally Posted by ~Darkseeker~
everything that goes onto facebook has to go onto their servers, it doesnt just float around in a cloud. in chat, you send your message to the server, which in turn sends it to your friend. The facebook servers will be many hundreds of Terabytes, if not multiple Exabytes in size, and nothing that goes onto facebook leaves in a hurry. Even if you delete a post, the post is still stored on the servers, it just isnt displayed on your wall.
I wouldn't say it would exceed a few Petabytes. The whole intire amount of computers in the world don't even amount to a thousand Exabytes. I don't think Facebook would amount to that.