Shatner - 6:30 am on Apr 28, 2011 (gmt 0)
Interesting data cropping up here.
The thing to definitely keep in mind is that we're all pretty sure it's not any ONE factor.
Probably just about everything discussed in the six pages of this thread may or may not play a factor depending on the site.
Maybe Dirgo has uncovered another factor to add to the list. I'm a little confused exactly about his specific number though, to be honest.