Facebook has integrated their real-time update notifications on home page and status page. When somebody posted a comment on your status, you will get a notification on your bottom right of the page, giving you almost real-time update to your activities.
The home page also gets an update by giving you a real-time update on your friend's activities and status updates. It will shows you XX new posts, where XX is a number and those number will keep increasing if you don't show them on your home page. When you clicked on the link, it will display all the updates on your home page.
Very nice features by Facebook.