URLFAN analyses popularity by RSS

://URLFAN is an evolving experiment designed to discover what websites the blogosphere is discussing all in real time. It does this by cultivating the content of thousands of RSS feeds and parsing billions of pieces of information. They rank sites according to their popularity in the fast moving and growing world of RSS feeds. And unlike Alexa, there is no approximating in the ranking system since they’re using concrete data to generate the results…