True, but I believe a lot of both Facebook's and Twitter's dev culture comes from ex-Google employees. So there could still be some groupthink going on. (Altern

True, but I believe a lot of both Facebook's and Twitter's dev culture comes from ex-Google employees. So there could still be some groupthink going on. (Alternatively, a victory for successful ideas?) Indirect evidence: both of them released open source clones of Google's proprietary build system "Blaze" -- Facebook's "Buck" and Twitter's "Pants". Google was actually last to the party, with "Bazel".