And to be fair, it's not like FB use Java for (much) performance critical code (AFAIK, obviously). I'd be willing to bet that lots of the core ranking/ads stuf

And to be fair, it's not like FB use Java for (much) performance critical code (AFAIK, obviously). I'd be willing to bet that lots of the core ranking/ads stuff at most of the major tech companies is written in C++.