Blog Networks come in a range of shapes and sizes and have been designed with different purposes in mind – but in a sense if you strip them all back they are simply clusters of blogs that are in some way linked together under a common name or banner.
Most of these networks are have some commercial aspect to them while others are more about about promoting blogs and social networking. Further Reading
Blogospheres is the world or blogging and bloggers. As defined in the wiki - Blogosphere is a collective term encompassing all blogs and their interconnections. It is the perception that blogs exist together as a connected community.
Blogging Network is simply where a group of blogging people share and interconnect their blogs with each other forming a blogging community. I think a lot of blogging networks need facilitation service in order to maintain and regulate and keep up with the blogging.
It was interesting to find out that you can get a job as a blogger for a blog network and it can be a great way to enter the world of professional blogging.
One of the most widely used Blog Network is http://www.b5media.com/ and it has over 30 million page views per month, so you can just imagine how popular this network is.