Facebook adds instant notifications, chat groups

Facebook just enabled two interesting new features that seem to be borrowed from the world of instant messaging. Let’s see what they are…
1) INSTANT (or “IMMEDIATE”) NOTIFICATIONS
Beginning today, when you are online with Facebook Chat, entire notifications will appear automatically and in real time above the Chat bar as pop-up alerts. For instance, if a friend has written on your wall, you’ll see a new notification appear like this:
After a few seconds, the notification will automatically disappear, but you’ll still be able to see a list of all of your notifications when you click on the notifications icon. You’ll also continue to see a count of all the notifications you’ve not yet viewed, indicated in red.
You can turn off specific types of notifications if you don’t want to receive them. When a notification appears, click the “X” to close it. You then will be asked if you want to permanently turn off future notifications of that same type.
2) CHAT GROUPS
You now have the ability to group friends, so that it looks like you are online for some but not for others.