Hello all, I believe I figured out to be what happened in my case to a large extent. I have some affiliate sites that were hit hard for some unknown reason and others that were not. I also have some pages that went down only 2- 5 spots, others that went down 30 - 300 spots! My sites are not IM, but rather tangible products so people use EBay and Craigslist to sell these products. When studying this relentlessly with plagiarism tools, it appears to be scrapers and namely big brands with copied content from my sites that were affected. In fact, the 7 pages that were hit the worst (fell 40 – 400+ listings back) were specifically the pages that copied from my site and pasted on EBay and www.kijiji.ca and 2 others from a large niche forum/classified site that had reused my sites content (without my permission or links back of course).
Okay, these are large and popular websites and Google may have a liking for them, however they have little to no editorial review on their listings and mostly copy and paste jobs (what happened to quality content is king). In fact, these sites don’t higher quality than the average website, because they don't really write their own content, but rather random sellers which mostly are too lazy to write their own content themselves and just do a copy and paste from some other site on the web... Their content is almost always copied or of low quality in nature, so I have no idea why the new 10/13 Google algo automatically assumes they are the original owners of other sites content. If I had this content years before anyone else, why would Google's algo think large classified sites and/or EBay with listings posted by random sellers should get credit as the true original, quality source of such content? I realize EBay and these classified sites aren't doing this directly themselves or intentional, however the fact is random sellers post the content and it’s often copied, low quality content at that, just to sell something. The sellers that use this service don't know, nor probably care about the effects of copying copyright information about a product they want to sell (they’re just interesting in getting more bids I suppose), however they should do a better job with copyright infringement and monitor the content in their listings better in my opinion..
Okay, in the past I do give Google props as they did a semi-decent job with figuring out who had the content first and the original owner of such, however this has really not been the case now with the recent Oct 13th update in my case. In fact the pages that were hardest hit and that dropped like a tank (or worst fell out of the serps completely), are the same pages that were copied from these big brand sites like EBay, kijiji.ca, Craigslist, and related classified sites that copy content from my website and paste the my content in their EBay/Craigslist listing. I guess the fact everyone wants to reuse my content is proof to its quality, however instead of be rewarding for my hard effort Google is penalizing my site enormously when I'm the victim of the content theft and to further kick me in the teeth, these same exact EBay and kijiji.ca listings with my stolen content are now on page 1 with the exact content (word for word) that was taken from my site!
Also, you would think that these listings that copied my content would go away after the ad/bid closes, however that isn't true any longer. These listings no longer go away after they are sold/closed, it looks like many of this scraped content on EBay was from listings that closed 6 - 10 months ago. From what I heard in the EBay community this is part of Ebay's SEO efofred to leave closed/inactive listings active, to flood as many listings in the Google serps as possible.., so these don't go away on their own.. I'm going to have to contact all these sites individually and request them to be removed I guess..
So if any one is using plagism tools such as Copyscape, I would look out for scrapers, especially if they're high pagerank sites like EBay and www.kijiji.ca.
By the way, I'm in the US and www.kijiji.ca is an EBay operated classified site Canada and it's 80% in French. Why are local classified ads in Canada on page 1 in the US serps whereas mine with the same exact content (and the original of the content at that) got bumped to page 37? DOesn't make sense with this Serp change. I hope these glitches are fixed soon.