I recently launched 3 websites (within the past 7-10 months) that had been steadily increasing in the rankings on Google search up until this past weekend, when I noticed a huge drop across most of my tracked keywords. The 3 websites are e-commerce sites. This drop coincided with the exact date and time (September 28) of Google's update to its infamous Panda update, Panda 2.5. I am wondering what the implications might be for new websites like mine with Panda 2.5. What is this most recent algorithm change targeting? Duplicate content, poor content, bad URLs?
Any new information on this would be of help.