Even if you hate Facebook you can sign up for the messenger now. Yes, its true you don’t have to have an account for the use of Facebook. We don’t know why you would want to use it maybe for a better texting experience on your phone?
Its just another avenue for Facebook to get user data off your phone and pin it against you as a consumer. Right now it only works in US, Canada, Peru, and Venezuela.
If you are not on Facebook they will have a button for you to sign up. But as we mentioned earlier Facebook messenger is huge so Facebook is assuming that all your friends are on it so changes are you can use it to communicate with them and they can take your phone data and you wouldn’t be any less wiser.