tedster - 6:07 am on Sep 23, 2010 (gmt 0)
Reno: It's possible that some sites are feeling this more prominently than others
Exactly - this is not a widespread phenomenon and it never was. It's something that is only rarely seen but when it is, the numbers a dramatic.
All the well-intended but academic questions and ideas are not very illuminating, because we're not getting input from many members who are working with the thing itself, in real time.
The test is to methodically check position for a small handful of keyword phrases at regular intervals
I think some proxy checking might also be in order to see geographic variations. Or, even better than a proxy (whose IP is usually well known to Google) would be if you have access to a VPN and can use that to check.