I'm not sure comments are exactly "shared" although this thread suggests that they might be shared via chatter. I don't know if it was implemented. mk might know. I'm sure there are many discussions on when or why people show appreciation for a comment. This might be the definitive one People will circledot a comment for any of the following reasons, and many more: They think the comment is good and adds to the discussion. They want the commenter to know that someone out in the wilderness has happened by and sipped from the same stream. They giggled at the comment and it cheered them up. or course, I shouldn't talk about "people." I circledot comments for those reasons but probably most of the time, it's to build the self-esteem of the comment-maker. I don't know if a circledot actually does build the self-esteem of the comment-maker, but there's some sadness in the hubskiverse and we do what we can. (Right steve) :-)