Facebook never disables an account without a reason or just for the fun of it.
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 behaviour 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
Check Facebook's terms and appeal if necessary.
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