From the New York Time's ethicist's mail bag:
After I was scheduled for a job interview at a university, a member of the search committee Googled me and found my blog, where I refer to him (but not by name) as a belligerent jerk. He canceled the interview. It was impolitic to write what I did, but my believing him to be a jerk does not mean I would not be great at that job, and the rest of the committee might agree. Was it ethical of him to cancel the interview? Ciara Healy, Augusta, Ga. (read more)
All I can say is that he's an idiot. Read my notes on googling here and here. Search committees aren't only looking for the best teachers, they're also looking for the best colleagues. And they have every right to do so.