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by humblebee 2875 days ago
I believe what is meant by the statement is only content producers can add external links to content they produce.

I am unable to take any content and add additional annotation for others to utilize. There appear to be other projects that try to introduce this functionality though such as hypothes.is [0].

It looks like the author is proposing an overlay system that can be applied to a variety of content types. Users can then apply different overlays that are geared towards different topics / audiences. Basically a swappable reference section.

[0] https://web.hypothes.is