What do I do? I need advice if you know alot about internet safety?

[Kaitlyn]

My blackberry pin is all over the internet because my ex boyfriend put it on there when we broke up. He also posted naked pics of me all over the internet and yesterday someone added me saying "this is not a game, send me more naked pictures of you or the 5 i have are being sent to all your twitter followers" and he knew my twitter and facebook and my name and showed me all the pics he had. he wouldnt tell me where he was from or anything like that. Im only 16 btw and im really scared i dont know what to do. I already deactivated my twitter but he already knows some of my followers and i put my facebook on protected and so that only i could see my friends. Please help me

p.s. i cant go to the police or tell my parents or anything , and also please dont judge me or call me a slut please