The wonderful thing about real conversations is that they are confined to that moment in time and to the people you have them with, whether they know you or not. If you're in a new bar surrounded by people you don't know having an interesting conversation you can be whoever you want to be for the sake of the discussion or simply for fun. If proponents of 'open' want to destroy that they can go suck it. I deleted my Facebook account last year and more often than not, despite having lost the connection of people of whom I have dear memories, with every new day I become more convinced that my life is better without Facebook.
