let the profile RSS feed show initial shared comment and link to share
I love the sharing feature (ala old Google Reader), but if someone is using a different RSS reader to follow my shares, the RSS feed doesn't contain the comment I placed when I shared the item.
Response comments would also be nice on the RSS feed, but not as important.
Adding that, would let my profile page be like a microblog.
The follower should also have an easy way to access the shared post specifically to add response comments.
Thanks!

Done. There is “tor:note” tag containing user’s note in plain text and “comments” tag containing link to user’s profile with specific post preloaded on top of it.
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bmenant commented
+3
The kind of feature which allows users not only to share content, but also to contribute in a free and opened way, out of "walled gardens".