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You can use Facebook Messenger without a Facebook account. (I haven't tried it, but I know quite a few people that do this.)

• alskdj21 8y ago
  As what I've heard from my friends, you can deactivate your Facebook profile and still have Messenger on. Though you can't use Messenger without creating a Facebook account.
  • nixme 8y ago
    Yes you can. You sign up through the Messenger iOS/Android app.