I think it can be useful and I would use it. Message on Hive could work. I even thought of this, if you send a message you pay a total of .002 HBD. The .001 HBD is the fee to send, the other .001 HBD is for the receiver, once it has been read !
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An interesting twist.
This does open up possibilities. However, we are back to the base question is there a market/need?
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