Ok, so here is a theory I'd like people to comment on.
Most of us have heard about Google's
webmaster alerts when a site is being removed from the SERPs. It's pretty new, so it hasn't done a whole lot yet. So, what's one way to allow it to do a whole bunch of testing?
My theory, which I invite anyone to comment on, is that all of the filtering for spam has been removed. Once the engine has been able to detect spam and noticed that it hasn't been removed in a given time period (a mistake will be fixed quickly, spamming won't), those webmasters will receive alerts and start being removed. From what I've heard in some private channels, it normally takes just over a week from when something major is done to a page for the results to get filtered, and as long as 3 or 4 weeks for other things to be detected and filtered.
This, to me, explains a few of the things that Jagger has brought up.
1) SPAM in the SERPs.
2) Several rounds of updates according to the blog
here and
here.
3) Starting to see some of the SPAM sites falling now that just over a week has passed.
Anyone else care to comment on this theory?
Brian.