I've trained myself to always check the privacy setting of any post on Facebook before revealing my true views, knowing it sometimes shows my posts to family and left-wing friends, who have in the past demanded explanations.
You have this "watching over your shoulder online" feeling constantly if you try to maintain a bipartisan friends list.
This website captures an element of that very well.
I am, at least in my little personal corner, much more concerned at the moment with the actions of fellow citizens than with large corporations or whatever. For now.