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There are a lot of potential use cases for Authorea's commenting feature. Comments on Authorea.  From transparently revealing an article's \textbf{collaboration process} (as opposed to using the authors-only Chat feature), to marking-up \textbf{edits}, to manuscript \textbf{review}, to deep \textbf{annotation}, \textbf{annotation}  and even \textbf{post-publication review}, \textbf{an open forum for post-publication scrutiny},  it is very versatile.\\ And currently it is pretty bare bones.  Here's how it works:  \begin{enumerate}  \item{highlight the text U wish to comment on (this will be displayed above your comment);}  \item{click the little Speech Bubble icon that appears;}  \item{this brings up an expandable \href{https://www.authorea.com/6868}{LaTeX} and Markdown supported text box;} box to the right;}  \item{type in and format your message\\  (you can embed (embed  links with \verb|\href{www.thelink.com}{displayed text}|);} \item{you can change the privacy settings, and then post!}  \end{enumerate}