....which refer to previous posts or posters, but don't add anything to the discussion, e.g. "I agree with x", "What x said", or even "^^ This.". What's the point, other than to get your username on the screen or jump on a bandwagon? If you're going to the trouble of posting, why not contribute something? If someone's already said exactly what you think, there's no need to post! Aaargh!