I checked out an interviewer on Facebook before I went to the interview. I could only see her photo, but from that I figured out that she was a single parent of two, as there were kids but no wedding ring. As a married parent of two myself I then had some knowledge of her, common ground, something to talk about, and a way of getting her onside with my need for some flexibility in working hours due to my family commitments.
I got the job. Cashback.