On the new "scrolling live comments" feature that was added today: it still needs some work. If the comments are expanded and you try to post, new comments are added and your comment form can scroll oot of your viewing window as you type :)
And when comments are collapsed your comment form will go up and down as shorter or longer comments come in
And when all this happens in your stream and a new post from another user comes in, again everything scrolls down
Basically Google a small real-time chat window (multiple actually in a single page) inside an area where usually you're supposed to have just a few comments. Obviously it's a lot more fun to have hundreds of people participate in a post but I can get chaotic (and at some point will get bored of it if they dont have a way to manage the situation)
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and apparently there is a 500-comments/post limit ?