Well, have no fear, dear reader. We're here to tell you that there is in fact a way to loosen Facebook's iron fist.
All you have to do is this: When installing the Messenger app, just stop it mid-download. Now go to the main Facebook app, click on messages, and voila! You will no longer be prompted to download the Messenger app.
Publicizing this quick fix may be a bit of a double-edged sword, as Facebook is likely to rectify the glitch once news circulates. So, enjoy the freedom it lasts.
And, remember: Facebook is watching. (Mashable)