On Facebook, when you reply to a post you disagree with, your followers will then see it in their timeline. This puts people who follow you in an awkward position. I want to unfollow you because I don't want my timeline polluted with nonsense about how great the former president is (for example), and the only way I can do that is by unfollowing you. So your momentary feeling of righteousness has a hidden potential cost you should be aware of. 1. You help a cause you disagree with and 2. You alienate your friends.  #