They not only googled me and knew that I was involved in K9 Search and Rescue (I was volunteering for my husband's organization and was their webmaster at the time), they knew lots of other things about me as well which they mentioned at the interview. Of course, to be fair, I googled them, too, before the interview.
As I've pointed out before, if someone were applying for a job and was googled, their postings here on CD might come up. A quick look could see that many of the CD members have personal accounts elsewhere, because they mention it in their signature files or in their profile. I can see what they look like because they post photos. In some cases, within minutes I can get a fair amount of information on a person. Just something to be aware of, that's all.