Contact me on dating sites saying things like, "You look familiar, are you an escort," or, "I've seen you on AW." Great, thanks for telling me you know where I work. Now I know not to consider you as a date.
And contacting me on a dating site after meeting me as a client, to say they had a great time when we met. I wouldn't message my hairdresser on a dating site and thank them for my recent haircur or my dentist for my latest check up!