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in the cases where we are outranked, it was usually ask.com search results pages (basically a scraper), experts123, askville, and sometimes facebook (where a user had copied/pasted our content).
I went through the heavy crawling, boost in traffic, then bottom falling out phenomenon on Feb. 24.
[edited by: tedster at 2:50 pm (utc) on Jun 17, 2011]
My own sense right now is that we're seeing two different significant updates. Something updated earlier in the week, perhaps with widespread A/B statistical testing. Then a new version of the Panda algo rolled out.
4. Other members are reporting that backlinks seem to be getting scored very differently, especially backlink that they arranged are either not counting anymore, or perhaps being penalized. This points to another algo update.
Do you have a time line on more details for this? I an NOT seeing this in a low-volume two-word keyword that I track. Neither for links acquired BEFORE Panda 1, nor for links acquired since.