blogs sphere

I don't know exactly what I'm going to say in this blog mainly cause I think I'm over complicating the topic here. How are the blogs and NY times articles I'm reading functioning as a press or news sphere? Truly I think the only reason that blogs are part of the press sphere is do to the fact that people go out and look for blogs that are going to bring them the latest and most interesting news. Not only that but the news and information they might fine is related to topics that they mostly want to hear about. I chose two blogs. One was Instapundit which is a strongly conservative blog and I chose it exactly for that reason because I rather here about topics that are more conservative than here about the ideas of liberals. I also chose Pro Football Talk do to the fact that I love football. I pay a lot of attention to the sport and know a lot about it. I'm no expert but in my never ending quest for knowledge I certainly love this blog because of the insight it provides into NFL teams and the league itself. Using blogs as part of your news sphere can be a problem though. Let me ask who the author is. The writer of the blogs could be some average Joe that doesn't know what the hell he is talking about. Knowing the credibility of the author will give credit to the blog and the writings.