Four and a half rules.

1. No illegal content.
2. No doxxing, threats or real-world harm.
3. No scams, spam or malicious files.
4. No raids / floods that make the site unusable.
5. ½ For everything else, do not take the internet too seriously.

This is a test build. Before a real public launch, age limits, moderation, privacy and legal obligations need to be defined properly.