The web version makes use of hypothes.is annotations, a tool that will allow you to make notes directly on pages both individually and collaboratively. Visit the Quick Start Guide here to create a free account and see how it works. You can start making notes by selecting text on the page and the options to annotate or highlight will pop up, or by clicking on the notes sidebar (right side of page). You can also use hypothes.is on Canvas or other online content by using the browser extension or bookmarklet. Private groups can be created to just focus on your notes or to collaborate with a group of friends. You can export these notes later for revision, or simply visit the page any time to see all comments.