My experience has been exactly the opposite, at least on FB. I find that if you express an opinion on FB, regardless of how non-confrontational your attitude, it entrenches opinions on the other side and things become confrontational. It's to the point now where I don't even bother posting about politics on FB because I don't have the time or energy to argue with people (many of whom I've known since I was a teenager) who do nothing but spew Fox News talking points without doing any thinking for themselves (something I had no idea they were going to do until they started doing it).