Ditto, ditto, and ditto.

It's never made sense to me that 'social' software inhibits social interaction this way.

In addition, even for people who are obsessive about checking their posts to see who has responded may MISS it b/c comments are not only nested by default but don't even SHOW the total nested comment counts. This misleadingly hides the number of comments and someone would have to not only obsessively look for comments, but worse - they'd have to obsessively expand every level see more of comments to look for the responses and/or to follow discussions.

Not very social!