Problems that basically persist for most tech companies in the Bay Area like commute sux. Hard to get a good commute, and if you do, then you're probably paying a steep price for it. Shuttles help a lot if you're coming from SF or surrounding cities, but still suck overall.
Generally, prices for housing suck anywhere you live in the Bay Area. If you're already here, then you already know that. If not, then be prepared - it sux.
Diversity is still a problem. Facebook is trying to fix this, and it comes up all the time about what more can be done which is good, but at the end of the day, it's still a problem.