Listen Notes
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Listen Notes is a search engine for podcasts with social silo functionality for listen posts, the ability to curate playlists, add notes to podcast episodes, create audio clips with comments, and want to listen posts.
The project was built by Wenbin Fang. It has an available API.
Much like Huffduffer, the service provides RSS feeds for playlists which allows users to subscribe to them in their favorite podcatcher.
The front page of the website has a now sort of functionality that shows what users are currently listening to.