Since news leaked out 2 days ago that Facebook has approached Mastodon developers and admins - requiring non-disclosure agreements first - the whole microverse (i.e. mastodon / pleroma etc, the micro-blogging part of fedi) has been talking about nothing but that and Facebook’s imminent entry into the fediverse with an as yet not clearly defined entity called Barcelona or p92. This woud be very roughly comparable to Reddit saying they are going to federate with lemmy.
Yet here on lemmy I could only find a relatively small discussion.
https://kbin.social/m/fediverse/t/62958
Did the lemmyverse not know or just not care that much?
For the source control system you’re thinking of Mercurial, and yep indeed that’s accurate.
They also notoriously open-sourced Hack and HHVM, their monolith’s language compiler and runtime. It’s a pretty narrow use case (having a PHP monolith and wanting it to scale), but they didn’t have to do it.
Anyway yeah, they indeed have pretty good genuine history with their open source efforts.