"Who is this strange person who's friended me, then?"

I'm Liz, I used to know you slightly when you lived in Oxford. At the last WGW I bumped into you when I was wandering about with davefish, and got very confused because I couldn't quite place your face.

(Not that I've been puzzling over this in the intervening months, just that I've only now got round to adding new friends and stuff.)