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\textit{Oh, There are a lot of potential use cases for Authorea's commenting feature.  From transparently revealing  an empty article!} 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}, and even \textbf{post-publication review}, this is a versatile feature.   And currently it is pretty bare bones.  You can get started by \textbf{double clicking} this Here's how it works:  \begin{enumerate}  \item{highlight the  text block and begin editing. You can also click U have a comment on;}  \item{click  the \textbf{Insert} button below to add new block elements. Or you can \textbf{drag and drop little Speech Bubble icon that appears;}  \item{this brings up  an image} right onto this text. Happy writing! expandable \href{https://www.authorea.com/6868}{LaTeX} and Markdown supported text box;}  \item{;}  \end{enumerate}