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Wikipedia

Blogosphere

The blogosphere is made up of all blogs and their interconnections. The term implies that blogs exist together as a connected community (or as a collection of connected communities) or as a social networking service in which everyday authors can publish their opinions. Since the term has been coined, it has been referenced in a number of media and is also used to refer to the Internet.

Wiktionary

blogosphere

n. (context Internet English) The totality of blogs, especially the unique jargons, cultures and shared interests created by their interconnection.