I am always seen as online on Google Chat/Hangout How can I make myself offline so that noone can see that I am available. I am unable to find this option after GTalk -> Hangout upgrade.
the availability option has been deprecated in hangout. To make yourself invisible or so, either you have to downgrade to gtalk or the easiest way you can do this by going to your gmail account from your pc. There you should find this availability option.