I've been thinking lately about how someone could use AI to make a "social network" site that works just like Facebook, except the user is the only real person and everyone else is AI. The AI users would respond very favorably to everything you post, and all of your posts would go viral. It would be kind of like an AI girlfriend, except instead of providing companionship, it would make you feel like you're famous and popular. (I doubt Facebook would want to be associated with a product like that, but I bet someone will make something like that eventually.)