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Not only your site - all of the results for that particular keyword search. Usually lasts for only a brief period. If you notice it for all of the searches you do, delete your cookies and it'll go away. Happens from time to time.
Usually lasts for only a brief period.
Google only lets us "see" the tracking code in effect for a brief period. All links are tracked all the time, it's just that the majority of the time it is hidden in javascript in the headers.
however, I think only a small percentage of clicks are tracked,
What makes you think that? On-off-on-off tracking wouldn't really provide decent data would it?
It was a tracking link in the format:
/url?sa=U&start=5&q=[PageURL]&e=1102
"start" indicated the SERP position and "q" the destination URL.
So the link parameters were slightly different to the current JavaScript system and the link was clearly visible when you hovered over it.
internetheaven I've never seen this before - why would they let us "see" the links at random? This does not make any sense to me.
"We normally don't track redirects on urls because it slows users down. That data is useful though, so we sometimes do random sampling to make sure that our quality is still high...........Checking on clickthrough a miniscule amount of the time is something that we've done for a long time..."
GoogleGuy [webmasterworld.com]