[charcircuit]

The open source version of phabricator is no longer maintained, but that only happened 1 year ago. Facebook's internal phabricator is still maintained and there is phorge which is attempting to fork and maintain the open source version of phabricator. Uber may opt to just maintain phabricator themselves.

>is used most of the time with svn

It supports mercurial, git, and svn.

>I 'm curious why they opted for it in the first place, instead of a more modern platform.

It is a modern platform and works well.

[jesboat]

Facebook's "phabricator" is very different from OSS, to the extent that at this point probably most of what's left is terminology and architectural boundaries. The diff (PR) UI was completely rewritten; I think repo browsing too. Most of the storage got refactored to use common storage code.