[passivepinetree]

Slightly OT, but I've only ever used Git for version control. At the end of the article, the author mentions that Facebook uses (a custom version of) Mercurial instead of Git.

What are the benefits to using Mercurial over Git?

[sclangdon]

If I remember correctly, the reason Facebook switched to Mercurial from Git was because they needed to make some changes or add additional functionality and Mercurial is an easier system to do that with, apparently.