I just don't get into conversations that I don't have anything to add too. In fact, I don't even read 15% of the threads on Z just for that reason. If the title doesn't interest me, I know it's pretty much a waste of my time. (Not to sound like an egomaniac or anything.) I just get bored, and that leads to being annoyed.
*I should add, if someone I like posts, I'll check it, even if it doesn't seem interesting.