Ok lets do a little test. If your "content farms" are being de-indexed please list the following: 1. Your keywords targeted 2. The number of articles on your blog. 3. What type of blog software (Wordpress, Joomla, etc.) 4. Is your blog gone or just lost rank 5. How many backlinks and what type of links are they? 6. Anything else you think is relevant but need some details about you blogs. We can pinpoint this fairly quick I have a theory that only competitive terms are being targeted. Google needs the micro niche blogs to fill in the gaps for adwords revenue. Clearly there are factors that they are looking for. Size may be one. I have several small autoblogs that are not de-indexed. Use of wordpress may be a huge factor because of the available autoblog plugins. One workaround is when you create niche blogs only post 4 or 5 original articles and there you have it. You can still rank for your terms just wont have thousand of posts. And believe me there will be a plugin soon to solve this issue. Probably many in the works as we speak.