So is Google:<p><a href="http://www.bloomberg.com/news/2013-12-12/google-said-to-mull-designing-chips-in-threat-to-intel.html" rel="nofollow">http://www.bloomberg.com/news/2013-12-12/google-said-to-mull...</a>
The proposed applications (network control plane) don't correspond to what you would write in PHP (the main Facebook app).<p>The arm64 stuff on the other hand is looming like being the first new RISC architecture since er alpha and there may well be a move towards using it. There was a story recently that Google has an ARM license too.
They've been hiring for this for a while now, <a href="https://www.facebook.com/careers/department?dept=engineering&req=a0IA0000006cPTMMA2" rel="nofollow">https://www.facebook.com/careers/department?dept=engineering...</a>