Well, yes, of course I have not done a rigorous scientific analysis. But I can tell you from repeated experiences that if I say anything a bit critical of Europe or Europeans then I will get downvoted heavily in the wee hours of the day, and almost always will make that up and then some about midday (Pacific time). On the other hand, if I say something critical of Google then in the wee hours it'll usually get a bunch of upvotes, and then lose them all about midday.

No science here, absolutely, but I have had great success so far predicting in advance what the voting pattern is going to be on a comment I make. I treat it a bit like a sport.