Gmail and Facebook can be linked. GTalk or Google Talk and Facebook cannot be linked together. It is because Gtalk and Facebook both have their own chatting systems.
Video chat on Gmail is legal. You can do it via Gmail chat or Gtalk. Hangouts is the latest name of the chatting system.
You can open Gtalk from Gmail not the opposite. It is because Gtalk is a part of Gmail. It is not the other way around.
In order to sign out of Gtalk labs, you have to log out of Gmail. The Gmail account is at top of the Gtalk. Signing out Gmail signs out of Gtalk too.
The password at Gtalk is same of Gmail. It is because Gtalk is a subset of Gmail. Gmail is the one that's password is unique.
Idle means the person is not chatting with anyone. The chat system is idle not working. It is the availability sign on Gtalk.
Gtalk settings are inside the Gmail settings. Gtalk is a part of Gmail so their settings are together. You can find it's settings when you go to account settings.
Yes.Chatting on gmail or gtalk is free.
Sign out in gtalk and open gmail and become invisible.
You can add mobile number in Gtalk easily. Adding one to the Gmail account adds it to the Gtalk. Gtalk contains phone numbers as users can call you.
You have to install the GTalk if it is not available. Gtalk is the instant messaging service of Gmail. It allows sending and receiving messages from Google Contacts.
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