Don't post comments that don't add anything to the discussion. If you don't have anything valuable to say, don't say anything. When you're just cruising through a thread in a leisurely manner, it's not too annoying to read through a lot of "hear, hear"'s and "I agree"'s. But if you're actually trying to find information, it's a pain in the ass. So save those one-word responses for threads that have degenerated to the point where none but true aficionados are following them any more.
Or short: NO spamming, unless it's funny.