This is the next SEO technique that Google appears to be going after (or has gone after big style in the last couple of months). A blog network is a group of blogs – normally bog standard wordpress installs, with basic wordpress templates and lots of content. Generally this content is generated explicitly for the purposes of creating links back to a website. Read more
Recently there has been a flurry of people reporting they have been hit with a Webmaster tools penalty that focus’ on the backlinks coming into the site – as this coincides with the most recent update to the Google Panda update (Panda 3.3) I’m assuming it’s part of this update.
Google’s Panda updates exist outside Google’s normal algorithm changes, they are run regularly to tidy up the rankings and the aim of them is to hunt out wrong doers and penalise them for their wrong doings. Read more