I would bet money that the site you are referring to is POF. They have some really ugly moderators that if they don't like you or what you say, they have the power to delete you. It happened to a bunch of friends of mine over a posted party while all the rules of the site were followed. Seems that one moderator just got jealous of the party planner and ruined it for over a hundred people. That's when most went over to a much friendlier site called datehookup. I just hate the name of the site since it sounds like a sex pick up place, but it's not.
I left POF on my own after that.