I think twitter used to be an example. You could tell because all their links were to http://twitter.com#the-specific-url-information-here http://twitter.com#th

I think twitter used to be an example. You could tell because all their links were to http://twitter.com#the-specific-url-information-here http://twitter.com#the-specific-url-information-here so the data had to be loaded via javascript. The problem is you get bad first-page load times (double-latency), but you get better second-page load times (no waiting for templates, just data requests).