If you said Wikipedia, MySpace, YouTube, flickr, and digg (in that order), nice work.

The takeaway is that website traffic follows a power law distribution. The top 4 or so sites on the web do orders of magnitude more traffic than the next 40, who do orders of magnitude more traffic than the next 400, and so on. By just about any measure, Digg and flickr are enormously successful sites - but you wouldn’t know it if you took a quick look at a graph of them compared to MySpace. So next time you look at Alexa, remember, it’s all relative.