hackers on FB?
Never heard of that but I think he is referring to ppl putting up private information that comes back to haunt them. Happened so many times I've read in the news that someone got intro trouble/fired/caught/etc/etc/ cose of facebook. Placing personal information on it like where u r n pictures can sometimes work against u.

That is y ppl from work on my FB, are kept on a limited profile listing so they c very few things. Close friends c all!!!