tangor - 12:52 am on Jun 13, 2010 (gmt 0)

Sounds like you'll need to embark on a "reminder of TOS" posting campaign. Use short sentences. Make statements, not explanations, and indicate a zero tolerance.

example:

Remain on topic.
No profanity.
No personal attacks.
No (whatever else that is restricted)
And finally:
No warnings are given. Failure to comply with the above will result in message removal (or account termination).

Do NOT get involved in "free speech" arguments as that is a rabbit hole with so many tunnels (different countries etc) you cannot win.