You know that new Facebook chat box shows both online and ofline friends in one box and you have to scroll down to see all online friends or search for the specific friend from the search area.
If you are irritated with this chat box and wants to remove it to show only online friends then Here is a solution.
Install "Facebook Chat Fix" Google chrome extension in chrome browser. Now the Facebook chat box will show the list of online friends only. Remember that this works in Google chrome only.