Lifehacker's guide to weblog comments
Em síntese (a negrito os que colocaria num "top 5"):
Stay on topic.
Contribute new information to the discussion.
Don?t comment for the sake of commenting.
Know when to comment and when to e-mail.
Remember that nobody likes a know-it-all.
Make the tone of your message clear.
Own your comment.
Be succinct.
Cite your sources with links or inline quoting.
Be courteous.
Don?t post when you?re angry, upset, drunk or emotional.
Do not feed or tease the trolls.