It would be useful if readers could underline text in others' articles as key points. Also, this is worth paying attention to the Top highlight function which shows the most underlined sentences among other users (the picture is from Link )
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Oldest comments (2)
This can be an awesome addition to my community
I see this kind of annotation being most useful as a function for comments... So that comments could be attached to a portion of posts dynamically.
It's sort of an augmented "quote"...