Yes, Facebook invests heavily in developer infrastructure. On my former team there were many staff+ engineers who were extremely capable. More speculatively I’d go so far as saying quality of talent is actually stronger than many groups working on public facing products.
Management of the group was also strong in my opinion.
Does Facebook maintain an internal fork of Phabricator or is it relatively close to mainline? It's such a great product but parts of it are quite clunky - I sometimes wonder if there's some internal secret sauce to smooth these out.
Developer infrastructure does not seem to be the right area to compare with here just like Google's internal engineering products aren't, more like - how polished are the tools used by the ad sales people, analysts, moderators etc.
Management of the group was also strong in my opinion.