You don't, but notch plans to add voice chat sometime soon.
Not on single player. On Multiplayer you can though.
You press T to talk.
You Can If You Press T
How? You can't.
You can talk to your residents but not other people.
yes.
Mike doesn't need a password. Just talk to him and he will talk back.
we can talk with our friend through text. and on the play-station if you have web cam you can do a video chat but you cant be in a game it doesn't work that way if your on xbox and have kinnect you can as it has a built in mic
no, but you can do a skype or hangout with who you are playing with while you are playing minecraft with them.
Yes you can.
Your character can only talk in firefight.
It's a double way to talk on a Bluetooth