Do you ever do further research with usernames of candidates? Like my facebook's url is 'foolmoron' and I have my e-mail listed as 'foolmoron' and such. Would you google that and look at my message board posts or whatever?
I go all-out. Any information I receive (Name, Location, School, Age, email name, samples), I will do my best to figure out anything and everything about you. Most of the time it's nothing major. If I see that you have a unique username, most people actually have 1 username they stick with on various mediums (youtube, twitter, facebook, old social networking pages, linkedin)
I had one guy who applied for a position that talked about the kinds of people who he hates, one was people who like ufc and drink pbr...well I like both :(.
If I'm gonna hire the guy and have him learn from me, we won't get along. Is it fair? Nope. But it makes my job a lot easier.