Conversing, conversation, dialog.
People who cannot talk may be referred to as mute or nonverbal.
Therapist
Charlatans.
People with schizophrenia may talk a lot. If they talk a lot without making much sense, this is called "schizophasia".
autism
the word is shy
It's called communication. No talking, no communication.
A conference call service is designed to help more people talk at once. During a conference call you can talk to numerous people at the same time, and share all the information once instead of calling each person individually.
tickle them
The best way is to talk with people. Talk and listen. Talk some more, and read.
One possible word is drawl.
Telepathy