> Google have many [...] buildable and deployable things, which have very different release schedules. Facebook don’t as they substantially have the PHP web-app

> Google have many [...] buildable and deployable things, which have very different release schedules. Facebook don’t as they substantially have the PHP web-app, and apps for iOS and Android in different repos. At least when I was there, the first sentence was true for Facebook. There was/is a separate repo for Thrift services (largely C++, but also Java, Python, and more), each Thrift service is a deployable. The deployables could be pushed at separate times and were usually pushed by teams themselves on their own schedules. The process was still frictionless and trunk-based: only difference was having to type a few well documented commands to push the service yourself. This may changed since, however.