Somehow I imagine that Microsoft might be involved in this, most likely through some quid pro quo to pimp its users for facebook. Its either that or its just that facebook sees linux as a threat as its not data harvesting like microsoft and facebook are, but I find it hard to believe that facebook would do this purely to protect the closed source market without also getting microsoft to pitch in someway. Why would facebook want a free operating system that doesnt harvest data to exist? Id be worried too.