pontifex - 3:55 pm on May 10, 2010 (gmt 0)
saying that longtail reduced because of a specific reason. Namely, that historically people refined their searches, resulting in longtail. Now they stay on Google property, using Google innovations for refinement, rather than adding or changing keywords
that was my first thought, too - but that would mean that other big sites would see the SAME effect, which they do not. Just a subset of us see the drop, others just stay in their volume on the same level!
That would mean that your theory only fits for certain sites, right?