I think people have gravitated to the 'news' or the 'facts' they liked for a long time. There is just more of it out there now. I still somewhat 'trust' the BBC, since they have actual guidelines on how to execute their reporting.
Everything you read or hear is going to be slanted. You will read and hear what you know. Very few people go out of their way to get 'the other' opinion. And if they do, most likely they do it to fortify their own viewpoint.
UGC gives more individuals a voice they did not have before. Traditional media had editors (other individuals) in place to filter those voices. Today the voices we hear - the websites and blogs we go to, are also market driven. If nobody reads your blog, how long are you going to keep doing it? Same old, same old!