Facebook Norms

An amusing video about the informal rules of Facebook. Which of these strike you as "actually" out there? Are there others? If the tests for a norm are

1. There is a pattern of behavior -- people seem to be following a rule
2. if you ask, people will say that there is a rule
3. if you behave contrary to this rule, people will react by sanctioning or punishing

have you seen evidence of rules like this? Ever see "you shouldn't do that..." comments? Can you recall real world conversations about what is OK and what is not OK to post? Have you ever learned "the hard way"?