Does grandma brag in front of the tax collectors about how much her children are making? Does grandma rat out the grandkids partying too hard to their parents? Grandma isn't stupid, grandma can keep secrets, but no one explained to her that Facebook isn't a benevolent entity. Her perception of Facebook is a cozy digital dining room where she can talk to the friends and family that don't have time to visit anymore.

I think it's important to remember that Facebook provides a service people really want, which makes it hard to convince them to mistrust it.