I've noticed a decline in the quality of comments since I am feeding General and Economics forum into this twitter feed:
http://twitter.com/bitrificIf there's one suggestion I would make then it would be to run a filter on posts such as
http://www.chrisfinke.com/comment-snob/ with the aim of preventing bad comments from getting through. Does SMF have a plugin like this?
Or else just adding moderation, or moderation for new members.