NewsBlur

NewsBlur is primarily an RSS reader that allows users to subscribe to feeds, read content, and train the system to show more of what they like. It has features for social sharing and community interaction, and offers mobile apps. While it has a 'training' system that acts as a recommendation engine, and allows for sharing and commenting, it lacks a rich text editor for original content creation and a direct monetization model for writers, which are core to the 'Medium' concept. It focuses on consuming and curating existing content rather than publishing new content.