a map of the Blogosphere by Matthew Hurst
I discovered that there are many kinds of blogs which can be also very different from each other: some are just personal spaces where people express themselves and their opinions in general; others are dedicated to specific topics which the blog's "owner" is expert at, or simply keen on; some other are related to more famous people or organization ( for example those of Beppe Grillo and Greenpeace). In sum, the blogosphere is an extremely wide and variegated universe in which, true, there are many interesting and important information, but there are also many useless or just curious things, and searching on it can be very exhausting. In effect, to find what you're looking for, you need a lot of Patience!