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.
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.
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".