First, the numbers. The Disqus commenting system (which we use on TechCrunch) is now reaching over 200 million people a month, according to their Quantcast data . That means it took them only about 6 months to double traffic. And by that measurement, it makes them the fourth largest U.S. network, with over 95 million of those users based in this country. There are now 500,000 communities and websites using the service. And there are over 18 million profiles and over 160 million conversations across the network. And so today it's time for the next step. Currently rolling out across their network, the latest version of Disqus (technically, version 4) brings three key things: a new design/interface, premium add-ons, and a new API.