A dApp would be best to properly display the message. As it is, it can be viewed in the same was as notifications we get when we receive daily drips of HIVE or other tokens.
Also, it would be the same 0.001 HBD/LEO/HIVE/Ecency Points/etc. bouncing back and forth between message recipients.
The Memo Key would be essential if we want to employ privacy measures. The other day I thought I saw a post with an image of such a message sent by @asphamilton, although I don't know how he was able to make his message private.
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