Anyone with a user account will be able to moderate comments. This lets people assign a score to a comment on how good they think the comment is or how visible they think it should be.
When more than one person rates a comment, the overall rating is just a simple average of all ratings. Comments with high ratings are more visible than comments with a lower rating. That way, comments that gain the approval of participants will gradually move up through statistical effects and pointless comments will sink into oblivion.
Hence, the purpose of comment moderation is two-fold:
- To bring the really good comments to everyone's attention.
- To hide or get get rid of spam, flamebait and trolls.
In the latter, comment moderation provides a technical solution to a social problem.