"...May not promote sites displaying ads through unsolicited mass emails or unwanted advertisements on third-party websites..." How do you classify third-party websites? What are unwanted ads? Can you advertise your ads to your friends via social websites (Friendster, Facebook, etc.) and through IMs?
Can't really do it through IM's - wouldn't that be pretty much telling them to click? And also I don't know which Instant Messengers would display adsense. Unwanted advertisemens on third party websites..so pretty much sites not owned by you. Unwanted I'm guessing sites where you aren't allowed to put up your own adsense ads..myspace for example I don't thinkt ehy allow it.