If you could un-invent something, what would it be?

It seems to me that all of the divisiveness started with MySpace, Twitter, and Facebook. When we made it easy to post our opinions online with very little or no context at all , we made disputes happen, perhaps even encouraged them to happen. Then politics did what it always does, actively try to divide us so that they could claim power. By giving the masses a voice that everyone could see, the masses now had some power of their own but had no idea how to weild it, so they simply started fighting each other as opposed to turning their power against the real enemy, the politicians who were watching them fight with glee.  The whole thing reminds me of my favorite quote from Denis Diderot, “Man will never be free until the last king is strangled with the entrails of the last priest.” Though perhaps it could be slightly modernized to include the last dictator.