MyKaroo
One way we control spam is with our comment-rating system. If a post is rated badly by enough users, it won't be displayed any more.
See the red and blue numbers next to each post? The blue "positive" numbers are "thumbs up" ratings; the red "negative" numbers are "thumbs down" ratings.
Click on the blue "positive" number to give this post a "thumbs up", or on the red "negative" number to give this post a "thumbs down". Click directly on the number.
Any user can rate any post, but for each separate post, you can only rate it one time.