People who don't reply to messages!
Even if its just to say 'no thanks, not what I'm looking for', it's not hard is it?
Th amount of messages i've sent to people who have a long list of 'i don't likes' i.e. whispers, winks, no pics, be original etc.. and i've been original, i've got pics, I'm what there advert says they are looking for... but to reply to me is too much effort!
Rant over! sorry!