No, 3D chat is not the same as video chat. Video chat is a 2D chat only. While in 3D chat we get to see all the three dimensions.
Only if they are in your video chat.
On the left, below the inbox/spam menu, you can see a chat box, there you have to invite your friends to chat with them. After they accept, you get their name in your chat box. Click their name in the chat box. If they are online, you can chat with them even if they are offline your messages will be sent to them and they can see it when they log on.
Anyone in the chat room at the time
No, you can't see facebook Chat text in Gmail. Gmail is a mailing service only. Thus it cannot link Facebook chat with it.
See cri-du-chat-syndrome-diagnosis
how you make your chat work on facebook it this you click where it sayed chat and you can see people if they are online or offline
See cri-du-chat-syndrome-treatment
You can see how to chat at the related link below.
you go to the bottom right corner and you will see "chat" and a green button click on that. you will see on line friends and the people with the green button have chat on line and click on one of those people. you will see a menu thing pop up and type a greeting. you can have more that one person on chat
You can use FaceTime on a Mac to chat with an iPod Touch (See links below).
Tiny Chat is a website where you can meet with your peers and if you have a web cam then you can hook it up and see your friends and they can see you. But if you don't have a web cam, there's a little chat box on the bottom and you can just type your thing in there and everyone whom you are chatting with can see it.