Robert_Charlton - 8:33 am on Jul 20, 2012 (gmt 0)
My emphasis and question mark added...
...high CTR that can be also achieved through long time adwords ads (i monitor big brands in a certain industry that now ranking at top spots in organic results even for 1 word keyword because (?) of daily top spots in adwords)
..."ranking"? ..."because"? There may well be all sorts of correlations. Some studies have suggested a symbiotic effect between top organic and AdWords CTR, but I don't think we can simply extend this automatically to a ranking cause.
We might be able to explain ad position, eg, with ongoing searcher satisfaction with the brand, or perhaps it's due to excessive ad spend. We might similarly be able to correlate organic rankings with exposure in all channels and thus with traffic derived from that exposure... but I think it's safe to say that without user engagement and satisfaction, exposure by itself may not translate into better rankings. I don't want us to take this discussion off topic, though. How do you relate these factors to the question of why these particular sites might have dropped?
With regard to the shuffling, I'm very curious about the traffic patterns the OP observed. They may suggest another aspect of the Google algo evaluation process, and they may or may not relate to the patterns of traffic shaping and throttling that we've discussed as "traffic shaping"....
Zombie Traffic and Traffic Shaping - Analysis
There's no question in my mind that constant shuffling we see in many forms is related to high speed statistical sampling, and I very much agree with tedster that there is some very heavy duty logic behind it. Beyond the inevitable latency that's going to occur in a multi-database system of Google's size, it's in no way random.