After selecting a comment or a subtree or group of comments, you can write a summary of these comments, with the help of automatically highlighted important sentences, and features to add citations. You can also tag, hide, or automatically cluster comments to organize the discussion.
Wikum uses a recursive summarization approach, allowing you to build summaries on top of other summaries, your own or others. That is, once you've written a summary of a subset of comments, another summary can summarize a larger subset of comments, taking into account your summary.