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Add contact

To ensure/record the identity (or psudo-identity)
 of the intended recipient.

sometimes

medium

Indicates that the user
knows someone

The contact
(sometimes)

Have a conversation

To discuss a topic securely while remaining as
anonymous as the user wishes.

often

medium

Expose information

Other people in
the conversation

Erase evidence of communication

Break contact or association.

rarely

fast

unsafe (can't undo)