On OK, Cupid?
OK Cupid sends you emails with new high matches in your areas. One day I got one from a username I hadn't seen before that I thought was pretty funny so I checked the profile out - it was my EX who I was still PINING over. Over a 95% match, my top match in my area. We're back together but not because of the OKC match, we both deleted it within days and never speak of it.