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I am looking for a program (preferably a web app like Google Docs) that enables lightweight commenting / review / annotation of textual content by multiple users.

I want something rather like Google Documents or Amazon Kindle's annotations, but preferably geared towards plain text. The ability to just 'tag' a specific word, sentence or paragraph would be helpful.

This would be for written content, but may be helpful for code too. Perhaps a lightweight enough code review tool would work for both text and code.

If such a tool supported tracking changes ('diffs') that would be helpful too.

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migrated from superuser.com Mar 9 '13 at 6:41

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