I actually only use machine learning to present options for you to filter or highlight. Everything is explicit, which means you know exactly what you're missing

I actually only use machine learning to present options for you to filter or highlight. Everything is explicit, which means you know exactly what you're missing and what's getting highlighted. (I refer to filter and highlight, but NewsBlur uses a traffic light of unread stories -- red is filtered, yellow is neither, and green is highlighted. You just flip between those three unread states with a slider control.)