Google began rolling out the latest iteration of its Panda algorithm on May 20th. As is the case with all major updates, results are mixed. Some sites have seen rankings and traffic drop, while others have seen improvement — and many sites have seen little to no movement at all. The big news surrounding the release of Panda 4.0 is the significant hit several large, well-known sites appear to have taken. Analysis performed since the update reveals some common...