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When I click on "link" on a comment in my chatter, like so: 
I am met with the comment and a reply box, like this: 
But the "markup" button that appears on regular comments (and after clicking "parent") is gone.
I'm using Chrome, Version 29.0.1547.57 m on Windows 8.
...Or maybe this is a "Quick Reply" feature that I'm missing the point of entirely...