I feel like getting people to vote for such legislation would be incredibly difficult if not impossible. Furthermore, even if this kind of voting were possible, it seems like to the degree that this were possible, voters would already be aware of the dangers of giving away their information and, consequently, such legislation would not be that helpful.

Users do not have a good idea of what they're giving away. Facebook & Friends have every incentive not to tell them. These companies have incredible lobbying power. If voters could be convinced to elect politicians who would enact such privacy-protecting measures, they would be demonstrating an unusually keen awareness to the dangers of giving away their information. In that case, they would probably be able to protect their children without government interference.

-- StevenWu - 30 Nov 2009