I will try not to be too confusing with this (tho confused is my natural state of being :P)
Whenever I comment on someone else's snapshot, it shows up on the homepage looking like I have comments to my update...like this:
You commented on Atlantis' snapshot
You havin' a yard sale? :D
@Divine~ - Me too!!
9 mins ago 7 comments
Even tho it's actually the person who posted the snapshot that has the comments added to his pic, not my update lol