That happened to me with ex-MC once--and other T's in that office (not my ex-T). It made me wonder if FB was either going off phone numbers in my phone or my location...or, hm, websites I've visited? Because it also suggested my gynecologist! (No, sorry, don't want to be friends with her on FB!)

Oh, and I looked via private browsing (not logged in to Facebook, so I wouldn't show up on his hopefully) and could see, well, his profile photo and background photo (which was mountains), but that was it. I think he had just created his account though--I'm thinking that's why he showed up then and not when the others showed up?