I honestly believe that therapists looking up clients happens much more than anyone in the profession would ever admit. Regardless of it being ethical, non ethical, rules or no rules, i think human nature and curiosity wins.

The problem with facebook is that it's so convoluted, and changes so much in its settings that no one knows what they are doing half the time. I mean, they mess about with all sorts of stuff and they can't come up with a "undo friend request" feature???