The only time I've ever unfriended anyone on FB is when some guy I didn't even know (but was a veteran, so hey) reached down into his bag of bigotry and railed on about how Mexico was going to rule California.
Hey, I have no love lost for the land of fruits and nuts, but that was a little much.
Other than that, the only thing I'm somewhat vocal about (when I have time, which is not often), 2A. As to the candy-dates for President, they're all big, steaming piles of shit -- both pachyderm and donkey.