Do hiring committees look at a candidate's StackExchange account? On StackExchange, some people use their real names, while others hide behind a username.

I was wondering, do hiring committees look at a candidate's StackExchange account and consider the candidate's activity on these accounts?

I know committees look at my website, they openly mention this during interviews.  They also ask me about things that they would only know about after seeing my website.  I have yet to connect my real identity with my StackExchange account, because of my reservations about this.
Yes, it can happen, though I expect it is rare.

I was recently asked in a job interview whether I was the Tara B on math.SE.  The interviewer who asked the question is also on math.SE, and we have answered some of the same questions.  I have met him in real life and e-mailed him once to ask for a paper, but I had the impression that he primarily remembered me from stackexchange.  (I did get the job, but I doubt that my SE participation was a significant factor.)

(Incidentally, this also demonstrates that even if you only use part of your name on SE, your account might still be noticed.)