Do you really think it&#x27;s all just tweets and ads? Spoiler art: it&#x27;s much, much, much more than that. Massive analytics stack, tons of distributed computing needs, lots of well-maintained OSS projects (Mesos, Aurora, Finagle, Pants, Bootstrap, Zipkin). I could name about 20 other things. The headcount may be a bit excessive but this is a caricature.