https://web.hypothes.is/event/annotate-this-2-explore-our-latest-releases-and-upcoming-product-roadmap/

• Social integrations: Daily digest emails for instructors
• Working on ability to reuse annotations on specific assignments and duplicate across groups/semesters/courses
• grading improvements

https://www.youtube.com/watch?v=N5xs2z2Vns0

Ran into Michael Grossman who said he also attended this.

https://factr.com/

A social network for "organizing and sharing your knowledge".

https://www.linkedin.com/in/michaelgrossman/