[lettergram]

Although I agree Facebook has a lot of subtle influence, it's only to a point. I firmly believe (no evidence) they are unable to change most peoples minds, they may be able to change their moods.

People create their own social bubbles outside of Facebook, Facebook then gives those social bubbles a way to communicate (messages, images, etc.) online - that's it. If Facebook started trying to do more manipulation, i.e. tried to change peoples minds or something, then people would likely stop using Facebook, because it would no longer be subtle.