At times, one may want to chat with someone without knowing others.
Then this thing will bring great help to you.
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Step 1: In bottom right of the FB window, there is chat
option...click it!!
Step 2: Now click on friends list..
Step 3: Create the list named, say [DearOnes]..
Step 4: Now see in chat window there will be a small [edit] written in front of [DearOnes List]..click on it.
Step 5: Then add your dear ones in it, to whom you want to do chat in private
Step 6: Refresh your page.
Step 7: See there will be [Other Friends list] and many other if you have created more before in the chat box...
Step 8: Now see that is there any [green color oval] after every friend list, now u just have to click on that oval to make that friends list offline and you have to do this for every friends list you created, this will turn you offline to them, and the oval now be showing gray color.
Note: all ovals should be in gray color except your [DearOnes list]
and dats it!!!!.