Too Long; Didn't Read
I was just looking through Quip’s recently released <a href="https://quip.com/about/live-apps" target="_blank">Live Apps</a> documentation. If you are not familiar with Quip, it is a document system that baked in real-time editing, communication and collaboration from the start. It was founded by Bret Taylor, formerly CTO of Facebook and was acquired by SalesForce in 2016.