I don't think that's it. Back when I was tracking tweets/sec on twitter's streaming API (which is supposed to be proportional to their real traffic) the pattern

I don't think that's it. Back when I was tracking tweets/sec on twitter's streaming API (which is supposed to be proportional to their real traffic) the pattern looked pretty circadian. Take a look: http://www.flickr.com/photos/hoop2w1/4208393947/ http://www.flickr.com/photos/hoop2w1/4208393947/