Facebook does not disable accounts for no reason or just for fun.
Check you email or sms for a Facebook notification.
Facebook disables accounts that don't follow the Facebook Terms. Some examples include:
• Posting content that doesn't follow the Facebook Terms
• Using a fake name
• Impersonating someone
• Continuing behavior that's not allowed on Facebook by violating the Community Standards
• Contacting other people for the purpose of harassment, advertising, promoting, dating or other conduct that's not allowed