One cohost problem I'm having at the moment (due to having actually gotten traction on a post) is that except through the notifications window there does not seem to be any way to see the shares (with comments) of a post!
Which is to say, a lot of people reshared the post with their answer in it, and I can't go to the post and browse to the shares that added something - honestly if they showed up in the comment list there (as a "X shared and added ..." link) or something it would be fine, but once these shares go too far down in notifications it's going to be a pain to ever find them again.