Hypothes.is

Hypothesis is a web annotation tool - you can annotate any page and your comments are then public for others to see (or you can privately annotate stuff)

Hypothes.is is an open source project run by a non-profit but I still have concerns about data ownership (What if their service goes down and all my annotations disappear overnight?)

Annotating Archived Content

It's been pointed out in a couple of places that hypothes.is can be used to annotate data in the internet web archive but what about in my own archive?