How do i know if someone hacked into my facebook account? i cant login?

Try retrieving it by resetting your password by answering your security question or email the facebook for assistance. it might be social engineering method or you just forget to logout when using foreign PC browser which allow stranger to access your account and play with your account information.

So what you do is - set your account so that you get an email notification every time someone logs in.

Then you remember to always sign out after a session and delete your login cookies.

Then use packet sniffing protection on shared networks.

All you really need is a password reset link sent to your email account isn't it?

It has been doing the equal factor to me = I can not sign off and are not able to see updates on the facet or read messages. It's not only my account however my daughters too. I dont think it been hacked purpose it is taking place to all that use this pc. Does anybody be aware of if there was a update I overlooked???

Do you have a cell phone attached to your acct? If so then you can use this to password reset