- Edit other user pages besides your own without permission.
- Create new categories without asking an admin first.
- Post false information
- Insult/use bad language with other users. If this happens, you should get a warning message on your wall.
- Harrass/threaten another user
- Create articles to advertise wikis or products. You can do that in blog posts. Doing it in articles is considered spamming.
- Remove content from pages you dislike. That's called vandalism.
- Remove all the content from one page that is not spam etc. without an admin's permission.