Official Steam Community Group:
http://steamcommunity.com/groups/ItsMods1

1. Thou shalt not spam.
2. Thou shalt not flame.
3. Thou shalt not post viruses.
4. Thou shalt not troll kids.
5. Thou shalt not advertise unless you got the permission by thou lord (=It's Mods Staff).
6. Thou shalt not post warez.
7. Thou shalt not post adult entertainment starring children. (also any adult content for that matter, not even images of Pedobear are allowed, blame Google, not me.)
8. Thou shalt not share accounts.
9. Thou shalt not bump a thread within 24 hours.
10. Thou shalt not link to, talk about or post cheats/hacks/tools that give an unfair advtange over other PEOPLE (so for singleplayer games it's fine).