Quite right. I changed all my IM accounts to some variation of nathanrdotcom in 2002 after dealing with a lot of harassment.
At the time I registered here on Wikipedia, User:Nathan was taken.
I've had the same Wikipedia username since February and nobody's commented on it until now. I think it's perfectly fine and there's only one person with a problem with it. I'm hardly co-opting Wikipedia for my own personal gain nor am I in any way disrupting it to advertise (I'm aware of WP:NOT). It would be different if my username was..let's say.. nathanr.com or www.nathanr.com, then that would be blatant advertising, but it's not and it isn't.
- Nathan (User:nathanrdotcom)
Will wrote: I had a friend who's email address was (let's call her Jane) janedotcodotuk at aol.co.uk.
And in Nathan's case, Nathan and Nathanr was already taken.