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Hypothes.is supports open and public annotations of arbitrary URLs, including tags and comments, but the intent is that all tags and annotations are public.

It does have an API, and can work via bookmarklets, or by linking to pages by prepending https://via.hypothes.is/

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Cool, thanks for the link! I don't mind the tags being public, but it seems Hypothes.is now also supports private/group annotations.

Unfortunately you can only annotate text (so far), but they might add deeper integration in the future to e.g. tag a section of a video.

In the meantime I started writing a Chrome extension based on Firebase. Having never used Firebase before I'm very pleasantly surprised how easy it is to get something up and running!

This blog post discusses using Hypothes.is to annotate on media, and provides some tooling to make it a little easier, if that helps you: https://blog.jonudell.net/2018/03/10/open-web-annotation-of-...

Interesting! Thanks! :)

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