Did Twitter Kill Media Diversity?

Remember how corporate media's campaign coverage used to offer wide-ranging, diverse perspectives? Me neither. But Washington Post columnist Dana Milbank apparently thinks that's the way the world used to work, until Twitter came along and the press corps turned into one giant exercise in groupthink. He writes today (10/24/12) that campaign reporters have one eye on the actual debates, and one eye on social media: This was to have been the campaign when Twitter and other social media allowed new voices to enter the debate, delivering a more diverse array of opinion and helping candidates reach beyond the media filter. […]