What a strange claim.
As an aside, recently the Facebook app (at least on Android) embedded its own web browser, so instead of going to Chrome when you followed a web link, it would open in the Facebook app. You can reconfigure it to use the external browser, but the power of defaults mean many won't.
This seemingly small change has a big impact because if you open a link you want to share, the Facebook app restricts you to sharing it via your wall, versus the traditional Android app where you might share it over hangouts, Google+, email, etc.