It's not a blogging innovation - it's just a stream of activity that happens to be related to Q&A. It looks somewhat similar to someone's FriendFeed activity stream, or Twitter conversation stream.
Quora and StackOverflow might have improved the traditional Q&A site by making it more about conversations than just "HOW DO I GET BABBY" questions, but it's not blogging. Blogging is more about writing about what's on your mind. In some cases your blog entries are part of a conversation, but it's at the same level that a newspaper editorial is part of a conversation.
Quora and StackOverflow might have improved the traditional Q&A site by making it more about conversations than just "HOW DO I GET BABBY" questions, but it's not blogging. Blogging is more about writing about what's on your mind. In some cases your blog entries are part of a conversation, but it's at the same level that a newspaper editorial is part of a conversation.