You are assuming people don't know that they're sharing with more than just their friends. You don't have any data to back this up. There is, however, evidence

You are assuming people don't know that they're sharing with more than just their friends. You don't have any data to back this up. There is, however, evidence to the contrary. 35% of users adjusted their settings when presented with the privacy transition dialog back in December, and that's not including the people who had modified their privacy settings in the past, which made them not default to "Everyone". http://www.readwriteweb.com/archives/facebook_brags_35_adjusted_their_privacy_settings.php http://www.readwriteweb.com/archives/facebook_brags_35_adjus... Some of these people in the search results know they're sharing with everyone. Some don't. The mere presence of people who don't understand their privacy settings doesn't suggest that a large portion of the Facebook userbase shares that confusion.