Facebook may lock your account if it detects activity that deviates from your usual patterns, such as an unusually high number of friend requests in a short period or a login attempt from a location very far from your home. To unlock it:
He had logged out because he felt heavy. He felt like a ghost haunting his own past. Facebook.com Login Identify
6/10 (Effective security, but plagued by poor customer support and privacy friction). Facebook may lock your account if it detects
: Cache and cookies can sometimes interfere with the verification scripts. Facebook.com Login Identify