A growing body of content is now available as a structured feed. While feed readers make use of this structure to organise various feeds in groups etc, Yahoo! Pipes allows the content of feeds to be manipulated programmatically. Yahoo! Pipes is not just a visual programming platform, the pipes created by the users are open source and can be incorporated or even cloned and modified. Pipes can be thought of as feeds of feeds (meta feeds) and can get to be extremely complex and powerful.