A couple of weeks ago, Yahoo! launched Pipes, a GUI that makes remixing and mashing up RSS feeds fun and easy to do. Since Pipes uses RSS data for input and output right now, the applications for social news are limited by the RSS features of the sites. The more RSS features they have, the more you can do with them in Pipes. That being said, there are a number of ways you can use Pipes to streamline your social news RSS subscriptions.