backdraft7 - 5:16 pm on Sep 26, 2012 (gmt 0)
I definitely think this is real time evidence of testing or machine learning. I've watched this rotation for several weeks, and it is predictable.
Still seeing a definite daily pattern since the early part of September. One morning conversion, usually around 7 am, then nothing all day until maybe 5pm, then a few conversions trickle in. The lunch crowd is no more. By the end of the day it usually ends up with a strictly limited number of conversions, what's funny is that if I'm short a sale, it magically pops in at around 11:45 pm.
Definitely clamped traffic.