Mostly they will just spam it, if they even do anything (if its not a hot chick they probably won't bother). Worst case scenario if its a chick: If her email address is available on facebook and uses the same username as her photobucket account she will likely be fusker'd. Fusker is a simple program that basically allows you to hack photobucket and look at/download pictures from someone's profile, even if they are set to private. Then if she has any nudes in there they will be distributed all over 4chan and jj.am and a million nerds will fap to her forever. Also they will probably then post said nudes on her facebook, for all of her friends and family to see, and at that point the ruination is complete.
But seriously thats like the worst possible case scenario, but it happens. If its a guy worst thing they might do is spam his parent's facebooks if they have them or something like that.