Hide your online status from selected friends

So you don’t want some of your friends to see you online on facebook chat while you are online. You can easily block selected people from sending you annoying messages, when you are busy with something else.

Simply open up the Facebook Chat and click on Friends List.

Start creating a new list called BlockList.

Once the list is created, add those friends to the list that you want to appear offline to. When the list is complete, hover your mouse to the little green icon adjacent to the list and click Go Offline. Bingo! You will now appear offline to everybody in the BlockList.