There are unwritten rules. I've tripped over several of them.
- Know who is who, and who is married (or whatever they want to call it) to whom so as to avoid stepping on TPTB's toes
- Don't bring up bad issues. What are these issues? If you bring one up, they'll let you know. I mention "tshirt hell" as an example.
- Certain websites are too naughty even for TFP. When you find out which they are, take the advice given to avoid them or pay the price you'll know of for sure only after seeing them.
The rest are all written down already, I think.