[tylerhunt]

Judging by this, it looks like his account was hacked: http://twitpic.com/ehm2h.

[zck]

Assuming that was his account (it seems like he'd be more likely to register _why), this is consistent with him deleting his account, and someone pouncing on the now-free username -- note that this account was created today.

[thenduks]

Just fyi, his GitHub account is/was 'why' and not '_why'. Wiki's are still there: http://wiki.github.com/why/shoes, http://wiki.github.com/why/hpricot, etc.

[doki_pen]

I think anyone could have created a new account with the name _why after he left.