If you can't get on facebook the first thing to do is send a message to the facebook team, they should message back and tell you why you can't get on. You may not be old enough or friends who are not old enough. They should soon put your account back soon.
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Contact Facebook - you will be expected to answer your 'security questions' before they'll reset your account.
If you can't post anything on Facebook, try deleting cookies and restarting your browser. If that doesn't work it may be a problem with the Facebook server.