Most likely your activities on Facebook caught the attention of hackers who do not like you or your posts. A possible solution is to contact Facebook and show them the messages you received from the hackers. I see a couple of problems with this. One is that I've heard of other people having a difficult time getting Facebook to help them, and I know some people simply abandoned their accounts and started new ones instead. Another reason this may be an issue is that you are incredibly paranoid and impressively delusional. You may not believe me, and so this effort may just be an exercise in futility. You have options. Option one: Contact Facebook, tell them you can't access your account and show them the messages you've received from "them". Option two: Abandon the account. Option three: Create a masterful fictional reality in which I am now the villain. If you choose that route, I will roll my eyes excessively, shake my head a few times, shrug and move on to something else, like attempting to give my cat a bath and later go to the store to buy bandages... that sort of thing.