Must admit I've stopped after the firtst, but: With thousands of programmers, what real features have been released to facebook.com? I often ask myself what those thousands of programmers do, as a user (I know not customer in this case) I can't see it. All of them mobile? Ads? Image recognition? With thousands of programmers should't the output be (5 people dev teams, one feature a month) hundreds of features/stories…
It's hard work to scale something as complex and inter-dependent as Facebook when you're operating at the scale of almost a billion monthly active users.