With the pervasiveness of Facebook and now Facebook Connect on so many web sites, it maybe time for Facebook to launch its own browser. Does the world need another web browser, probably not but they could use Webkit as the rendering engine and then add social layers to the browser. This would allow you as a user to stay on Facebook chat as you moved around the web, would make it easier to share links and “check in” to web sites and of course for Facebook would give them invaluable data on mapping your social graph to your favorite sites to provide a much richer ad experience. If they could get users to adopt such a browser, they could quickly start to attack Google in search and discovery.