Amused that my comment was down-voted when It's widely known that Mark would work 'hands on' on the codebase [1] as recently as last year.
[1] http://techcrunch.com/2010/04/14/apparently-mark-zuckerberg-...
[1] http://techcrunch.com/2010/04/14/apparently-mark-zuckerberg-...
This excerpted anecdote indicates it was mainly a leadership gesture to rally the troops. Still pretty cool that he'd bother, though.