This is what i've come to conclude about the Panda update. Google slapped "content farms". These are basically sites which populate themselves with posts from another site or very similar content. Now this makes sense, so why are really good sites with 100% unique content dropped in rankings? It is a knock-on effect of slapping content farms. The better your content, the more content farm websites wills crape your content and host it. This has been helping many websites rankings, but now, because the content farms have been slapped, the links pointing to the really good websites have been devalued. This is why really good websites have consequently dropped in the ranking as well. We've also heard a lot of people noticing that article marketing robot is not having the same effect on their website. This is likely because a lot of article directories accept duplicate content. Article directories have also seen a huge drop, including Ezine articles! Many of us in niches where people don't tend to link to your content or copy it are completely unaffected. Just to note, I don't believe profile links are affected by Panda, I have no reason to believe this. Conclusion? The duplicate content "myth" is now a reality!