Prismatic (used to be at https://getprismatic.com) - a topic/interest based newsfeed platform, but backed by an ML/AI system to learn from your reading behavior. I loved the product until it got shutdown one day :-(
iirc Prismatic was always an experiment in the technology, and I think they got the data they wanted before moving on. But yeah I used it as well and miss it. Fond memories from my enthusiastic clojurist days :)
