Google with YouTube and Twitter? Even though most congressional hearings are a farce, Google didn't even show up to speak with congress. The amount of racist, nazi propaganda I'm exposed to on Twitter every day far outnumbers what I've ever seen on Facebook.
Another commenter mentioned Equifax, which I agree is a good example. They have done a lot more to damage me than Facebook could hope to. (I don't have a choice about being in Equifax's database, but at least I can block the little informants on websites I visit.)