Feedly.com development and feed parser

Is http://feedly.com built using PHP, Java, or some other language/framework?

I have googled for some information on it, and saw that it uses JSON/REST extensively. But, I am not sure as to what feed parser is used to render images and videos into the application so elegantly, ie:

_{(source: lifeinthefastlane.com)}

Is this about the feed parser, or the rendering? At any rate, the feed parser is google's, and likely derived from the eponymous python package. The rendering is client-side javascript. This is a very cost-efficient, stateless architecture.