Facebook rolling new change,Live updating for the stream
7:49 PM | View Comments | Facebook, Internet, Social Network, Stream, Technology, Web, Web 2.0

Beginning today, that stream is going live. The stream now updates automatically and gives you the option to view new posts with a prompt at the top of the page immediately below the Publisher. Before today you needed to refresh your browser to see the most recent posts from your connections since logging in.
Facebook is rolling these changes out gradually, so they will be available to everyone soon.
Recently YouTube rolled out it's RealTime version & FriendFeed also having same kind of functionality