In reply to Brad Dalton.

Generally speaking, this is something we'd like to find a way to improve on, but it's tricky. The primary difficulty is in letting the presenter know about the comment, as typically the person leaving the comment is leaving it for them, but they don't get a notification. That notification instead goes to the "author" of the post on WordPress.tv, so closing the loop between the presenter of the WordCamp talk, and the conversations on WordPress.tv would be a big win.