A need for speed: the path to a faster loading sequence

While signing in to Gmail, I saw this really interesting article regarding how Gmail crew has improved Gmail loading sequence. It's really worthwhile reading if you are in to web development.

http://gmailblog.blogspot.com/2008/05/need-for-speed-path-to-faster-loading.html

But I wonder whats this popular network site they are referring to... ;)