A 2-way communication (Two-wayCommunication) Offline communication directly from senders to receivers. The sender can send pictures, documents or information for the purposes of the messenger. Contributes to the perception. And behaviors that a messenger needs such as chat with friends, send pictures to send information about the promotion of products to the market, etc. The audience can also show reactions (Feedback) directed immediately cause the sender. substance of the communication can be measured immediately.
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