I just saw my Facebook account and got something new layout on the bottom right that is chat icon that has moved aside to the left of notification. I thought Facebook did something error as few days ago but it is not.
It is a new Facebook layout from Facebook social networking. This new layout is also accompanied by new feature in organizing your connections and to control which friends see you online. This is a great feature where the users can chat just with certain people without disturbed by unwanted people. At leas this is a way to have a new look from FB.
You can read full post at Friend Lists: Now in Chat