Facebook is evil, disguting privacy violations
Facebook is paying people (including children, who are "required" to have a parent sign off on it) to have them spy on their phones.
Facebook sees EVERYTHING they do on their phone! Every app, every message, every website.
Even if you are tech-savvy enough not to fall for this, and aren't desperate enough to sell your privacy, some of the people you message with might, without you knowing, give *your* messages to Facebook.