Blog catagory

I think I want to focus one of my catagories on the motive for the blogs I'm hoping to analyze. I wonder why the blogs I'm thinking of using (search engine blogs, such as Ask.com, Yahoo.com, and Google.com) exist, because part of me feels that they're not just keeping their consumers up to date on their company. I want to find out who exactly the blogs represent (which will probably be the easy part), and why they have chosen the blog field to convey what they want.

From seeing what I have in my research so far, I get the impression that those blogs are more advertisement-driven than anything else, especially in Ask.com's case, as seen in my last post. Even though these blogs are (by definition) in fact blogs, I'm really starting to wonder if there's another realm of blogs solely to advertise. This thought ties in with another one of my possible catagories, focusing on the audience, seeing as how most blogs are directed to a group of people. How does the audience react to these blogs? Do they see any ulterior motives in the blogs, specifically from the advertising point of view? Or am I just being cynical? Either way, the motives of these blogs will be one of my main points of discussion, whether it turns out that I right or wrong.