A blog network is a group of blogs that are connected to each other in a network. A blog network can either be a group of loosely connected blogs, or a group of blogs that are owned by the same company. The purpose of such a network is usually to promote the other blogs in the same network and therefore increase the advertising revenue generated from online advertising on the blogs.
In the past, a common use for blog networks has been for Search Engine Optimization where a company or website could easily obtain many strong backlinks by posting content onto blog networks. However, in recent years, blog networks have become almost exclusively associated with unethical Black Hat SEO because Google has clearly labeled them as a type of manipulative SEO practice. Now, links from blog networks will commonly lead to Google penalties including significant loss of search rankings. As a result, blog networks have now lost popularity except in Back Hat SEO circles.
From simple blog network idea has evolved a more profound and less traceable edition, the private blog networks (often called PBNs). Private blog networks are not connected to each other and are made up from expired domains. The purpose of it is to take advantage of the existing backlinks of the expired domains. Effective sites of private blog networks has the common attributes of being on different c-class IP addresses, having unique content on them and are differentiated with unique design. 
- "Definition of: blog network". PC World. Ziff Davis. Retrieved 2010-03-22.
- "Encyclopedia of Risky Links and Link Building Practices". Rewind SEO. Retrieved 2014-02-22.
- "How to build and where to host your private blog network". SEO Take Over. Retrieved 2014-06-29.
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