Conversing, conversation, dialog.
People who cannot talk may be referred to as mute or nonverbal.
Charlatans.
Therapist
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
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.
It's called communication. No talking, no communication.
tickle them
One possible word is drawl.
Telepathy
The best way is to talk with people. Talk and listen. Talk some more, and read.