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CainIV - 4:21 am on Apr 5, 2008 (gmt 0)
Lots of speculation - is it an update, tweak, glitch, algo change. I do not see any real reason why Matt would completely reveal anything about the inner workings of Google as it relates to updates corresponding to rankings in a forum where there are heavyweight SEO's. One would say he is likely doing his job best if he is skewing the ability for people who use tactical advantages to rank better to do their jobs... Just my 0.02 :)
I'm sure we could come up with many reasons if we think hard enough why this is happening.