tedster - 1:36 pm on Dec 21, 2009 (gmt 0)

There are even longer standing complications to knowing what ranking your URL had when the visitor clicked on it. Geo-targeting, for instance, which can even introduce SERP variations across sectors of the same large city (NYC, for example).

Back in April, Google announced that they would be rolling out a new kind of referer string - one that includes the position of the URL. See [webmasterworld.com...]

I recently went looking through server logs specifically to see what is going on with that roll-out, and I'd say it's nearly invisible right now - well under 1% of visits and nothing to count on. I hope they do get all the compatibility issues worked out soon, because this would be very useful data to have.