I found these screen shots annoying. They added nothing to the FR conversation. They slowed down the refresh and clogged the pages.
That can be an issue. It's up to the poster not to flood a thread with screen captures that don't add to the discussion but sometimes they can be priceless.
Drudge used one of my screen captures one time showing Russert in a split screen shot with Colin Powell who had walked off the MTP set.
I love live threads with screen shots.
I believe you can adjust your browser settings to block the images.