So, we all agree on this^. There should be a button you can press that says "this".
I think there should be a "Like" button. Something to acknowledge a good post. An something to show a little respect to a post that you either:
A) Don't have time to reply too
B) Don't have much to say or think of something to reply too
There are a lot of intelligent conversations, ideas, and thoughts that deserve respect. The occasional funny ones are okay as well. I don't mind a troll here and there. Unless it's a complete idiot who does it every 2nd post.