I made a (much shittier, slightly different) version of this for a hackathon a while ago as a chrome extension! Basically, it lets people go through a webpage

I made a (much shittier, slightly different) version of this for a hackathon a while ago as a chrome extension! Basically, it lets people go through a webpage and talk about it together, or let one person "present" a webpage to others. The element the presenter is hovering over is highlighted to all others, they automatically follow his/her scrolling and navigation (to other pages), you can annotate with stickies on a page and it has a chatbox.