Indeed. My comment only shows that, but as a follow-up it's also clearly not a forked codebase. Facebook UI changes show up at the exact same time, and as a pra

Indeed. My comment only shows that, but as a follow-up it's also clearly not a forked codebase. Facebook UI changes show up at the exact same time, and as a practical matter they must be syncing regularly if both access the same underlying storage.