Now, let's not forget who Facebook is - and how they make their money. There's no doubt that one should worry about their privacy when using Facebook, but this whole conspiracy theory about the new Messenger is just outrageous.
From TechRepublic: Misplaced fear about Facebook Messenger for Android
With that said, don't be afraid to install the Facebook Messenger app and get your social media chat on. - Jack Wallen, TechRepublic