Rule 2 and 4 would be the most important rules in my private policy to me.
Rule 2 is important to me as this stops Instagram from targeting people with their advertisements. A personal example of this would be recently I liked a gym equipment page on Facebook and now I get adds which are constantly advertising pieces of equipment that I don’t need or want.
Rule 4 is critical as this is private between the user and the person he\she is messaging and there is no need for Facebook to be allowed see this and use the info contained in messages. I do think authorities like the police should be allowed access to this kind of info as sometimes it is within the best interest of the 2 messengers.