I have actually seen the websites moving up and down because of these updates.
Ya I totally agree with you but whenever there is a big change in algorithm google lets us know through its blog updates and this update was a big one.
Last week google make their PR update.But there was not much effect on the search query. Even most of the webmaster did not, even, realised its effect on their ranking.
Last edited by LD; 08-06-2012 at 08:51 PM. Reason: add