I worked for FB in NYC, and found that when visiting Menlo Park hq, the open plan there didn't bother me at all -- if anything, I was actually way more productive there. The density at MPK was low enough that the noise/distraction level was minimal, and all of the surrounding teams were working on similar parts of the stack. I've previously been skeptical of open plan, but this setup was really ideal for collaboration. (that said, this was one of the older formerly-Sun buildings; I never experienced the new, larger, more open building.)
But meanwhile in NYC, the density was much much higher, and team layout totally random, to the extent that I left the company for these reasons alone. It was impossible to concentrate without wearing noise-cancelling headphones, but I couldn't wear those for 9+ hours a day without getting a migraine.
It was frustrating since I otherwise liked my job, loved my team, loved the technical challenges. Space-wise, it looks like things are finally much better in the NYC office these days, but I'm still very hesitant to consider returning to the company after my previous experiences.