Toughy. Sometimes i quote people and don't add anything as they've worded what i wanted to say beautifully. Sometimes i just say 'lol' to threads as i find them amusing. Sometimes i say 'no' because i disagree, but don't care to explain. I do not say 'TL;DR' because it literally means i "didn't read" the OP. Doesn't contribute to discussion, but neither do the three examples above, really. Difference is that 'TL;DR' holds as much ground as posting 'bump', which is indeed against the rules. While completely opposite, they do the same thing. Someone bumping a thread to the top with no rhyme or valid reason.