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According to 4chan, anyway. 
1. Do not talk about /b/
2. DO NOT talk about /b/
3. We are Anonymous
4. Anonymous is legion
5. Anonymous never forgives
6. Anonymous can be a horrible, senseless, uncaring monster
7. Anonymous is still able to deliver
8. There are no real rules about posting
9. There are no real rules about moderation either - enjoy your ban
10. If you enjoy any rival sites - DON'T
11. All your carefully picked arguments can easily be ignored
12. Anything you say can and will be used against you
13. Anything you say can and will be turned into something else - fixed
14. Do not argue with trolls - it means that they win
15. The harder you try the harder you will fail
16. If you fail in epic proportions, it may just become a winning failure
17. Every win fails eventually
18. Everything that can be labeled can be hated
19. The more you hate it the stronger it gets
20. Nothing is to be taken seriously
21. Original content is original only for a few seconds before getting old
22. Copypasta is made to ruin every last bit of originality
23. Copypasta is made to ruin every last bit of originality
24. Every repost is always a repost of a repost
25. Relation to the original topic decreases with every single post
26. Any topic can be easily turned into something totally unrelated
27. Always question a person's sexual preferences without any real reason
28. Always question a person's gender - just in case it's really a man
29. In the internet all girls are men and all kids are undercover FBI agents
30. There are no girls on the internet
31. TITS or GTFO - the choice is yours
32. You must have pictures to prove your statement
33. Lurk more - it's never enough
34. There is porn of it, no exceptions
35. If no porn is found at the moment, it will (eventually) be made
36. There will always be more fucked up shit than you just saw
37. You can not divide by zero (just because the calculator says so)
38. No real limits of any kind apply here - not even the sky
39. CAPSLOCK IS CRUISE CONTROL FOR COOL
40. EVEN WITH CRUISE CONTROL YOU STILL HAVE TO STEER
41. Desu isn't funny. Seriously guys. It's worse than Chuck Norris jokes
42. Nothing is Sacred
43. The more beautiful and pure a thing is - the more satisfying it is to corrupt it
44. Even one positive comment about Japanese things can make you a weeaboo
45. When one sees a lion, one must get into the car
46. There is always furry porn of it
47. The pool is always closed
48. Do Not turn your back on Anonymous. Do not Betray Anonymous. Anonymous does not forget and neither should you. What Anonymous gives, Anonymous can take away. We control everything.
1. Do not talk about /b/
2. DO NOT talk about /b/
3. We are Anonymous
4. Anonymous is legion
5. Anonymous never forgives
6. Anonymous can be a horrible, senseless, uncaring monster
7. Anonymous is still able to deliver
8. There are no real rules about posting
9. There are no real rules about moderation either - enjoy your ban
10. If you enjoy any rival sites - DON'T
11. All your carefully picked arguments can easily be ignored
12. Anything you say can and will be used against you
13. Anything you say can and will be turned into something else - fixed
14. Do not argue with trolls - it means that they win
15. The harder you try the harder you will fail
16. If you fail in epic proportions, it may just become a winning failure
17. Every win fails eventually
18. Everything that can be labeled can be hated
19. The more you hate it the stronger it gets
20. Nothing is to be taken seriously
21. Original content is original only for a few seconds before getting old
22. Copypasta is made to ruin every last bit of originality
23. Copypasta is made to ruin every last bit of originality
24. Every repost is always a repost of a repost
25. Relation to the original topic decreases with every single post
26. Any topic can be easily turned into something totally unrelated
27. Always question a person's sexual preferences without any real reason
28. Always question a person's gender - just in case it's really a man
29. In the internet all girls are men and all kids are undercover FBI agents
30. There are no girls on the internet
31. TITS or GTFO - the choice is yours
32. You must have pictures to prove your statement
33. Lurk more - it's never enough
34. There is porn of it, no exceptions
35. If no porn is found at the moment, it will (eventually) be made
36. There will always be more fucked up shit than you just saw
37. You can not divide by zero (just because the calculator says so)
38. No real limits of any kind apply here - not even the sky
39. CAPSLOCK IS CRUISE CONTROL FOR COOL
40. EVEN WITH CRUISE CONTROL YOU STILL HAVE TO STEER
41. Desu isn't funny. Seriously guys. It's worse than Chuck Norris jokes
42. Nothing is Sacred
43. The more beautiful and pure a thing is - the more satisfying it is to corrupt it
44. Even one positive comment about Japanese things can make you a weeaboo
45. When one sees a lion, one must get into the car
46. There is always furry porn of it
47. The pool is always closed
48. Do Not turn your back on Anonymous. Do not Betray Anonymous. Anonymous does not forget and neither should you. What Anonymous gives, Anonymous can take away. We control everything.