I've just been speaking with a potential client. He has 19 similar sites. they are all legitimate businesses which target a different sector of the job search industry. Not long ago he linked in the footer to each of the other sites and noticed a drop in rankings. He removed the links but then in the last Panda update "2.2" one of his sites went from position 2, to page 5. I explained that it could be Panda and hopefully he understands. Here's the thing; I've been researching the Panda update across multiple boards and websites. I'm reading everything I can on it. The problem is we know so little about what is actually happening when they run Panda. We know that Google is trying to remove webspam like content farms, duplicate content and websites which rewrite content. We know they are targeting link wheel type content farm sites and also made for adsense sites. But HOW are they doing this? You can find some good articles about it here Code: http://search.searchengineland.com/search?w=panda I think for the future of the SEO industry we need to crack what makes Panda tick. There are sites dropping from the sky for reasons we just can't explain and until Google runs the next Panda update, we never know if anything we change will help the site return to its' normal position. These are legitimate sites as well, not just content farms which are being slapped down. Apart form building links and maybe diversifying the content what else can we do? The problem is, how can we rectify the problem(on a very whitehat site) when we don't know what has caused it to be flagged by Panda in the first place? So do any of you understand something more about the Panda update than this? Have you got a theory on it?