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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 September 2014 Google targeted private blog networks with manual action ranking penalties. This served to dissuade SEO and online marketers from using PBNs to increase their online rankings. The "thin content" warnings are closely tied to Panda which focuses on thin content and on-page quality. No Hat Digital published a blog post highlighting the de-indexing of their PBN. They go on to say that "although PBNs still work, they now have a history of being targeted by Google and therefore may not be the safest option. Which is why we now focus on creating online businesses that are independent of SEO traffic."
A blog network may also refer to a central website, such as Wordpress.com or Boosites.com, where a user creates an account and is then able to use their own blog. The created blog forms part of a network because it uses either a subdomain or a subfolder of the main domain, although in all other ways it can be entirely autonomous. This is also known as a hosted blog platform and usually uses the free Wordpress Multisite software.
Hosted blog networks are also known as "Web 2.0" networks due to their rise to popularity during the second phase of internet development, known as We 2.0 when interactive social sites began to rapidly develop. 
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