(很多人都在用，就不标出处了，就当Public domain好了)
A. Because it makes the logic of the discussion difficult to follow.
Q. Why shoudn't I top post?
A. No.
Q Should I top post?
A: Because it destroys the flow of the conversation
Q: Why is it bad?
A: No, it's bad.
Q: Should I top post in replies to mailing lists?
