Tens of thousands of have been raped, entire towns have been destroyed, around 50k killed and 700k forced to flee.
If Western countries actually cared about the human cost of this genocide, it would be almost a trivial matter to stop it overnight with a few well placed missiles against Myanmar's military, which continues to perpetrate the genocide even today.
Instead, no real action is taken and it's just a talking point for "Facebook bad." Blaming Facebook for a genocide is like blaming videogames for an active mass shooter w/o actually doing anything to stop them.