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There is already a DM option. Just send 0.001sbd(could be more if you are generous :) ) to your target and put your message in the memo. The only catch is that your message would be public. Well you asked for Direct Message right not a Private message :)

You have a point! Maybe we'll have this feature sometime in the near future.

Blockchain loves transparency. So it's a NO from blockchain :)

yes, of course its about transparency. but in my opinion, this is what mainstream users would miss on this platform.

Yeah... I guess they'll get use to it :)