You people will notice there are little links around the Avatars. When you have more than ten posts you can click on "Good post" If you think it was a good post, or on "Try again." if you think it was a bad post.
Alternatively you can just leave it. But if you people think you read a good post then give the poster a brownie point hmm?
Then His Karma points go up with one point.
Its good food for the ego.