From their site: A set of RESTful services, which developers can use to leverage our unique capabilities. These services can be used to build applications for the desktop or mobile environments, platform-based applications such as Facebook, Friendster, and OpenSocial. Other uses include AJAX or Flash widgets, search and bookmark plugins, and others. StyleFeeder is a personal shopping engine that makes personal recommendations. It's a great way to discover new products and keep track of what you're shopping for online, using visual bookmarks.
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So far, we don't have a record of any changes to this API