I think one difference is that people inhabit and create social media in a way that they didn't with print and TV. A significant percentage of our lives is spent in these de factor public squares.
As a media company that 'creates' tweets to be displayed on CNN, etc., or read by logged out users, the analogy to traditional media is more straightforward.
As a media company that 'creates' tweets to be displayed on CNN, etc., or read by logged out users, the analogy to traditional media is more straightforward.