Sort:  

It is possible. However; it is difficult. The private message would have to be encrypted. They could also make the private message simply be a feature that does not interact with the blockchain.

Coin Marketplace

STEEM 0.06
TRX 0.31
JST 0.060
BTC 71307.64
ETH 2164.66
USDT 1.00
SBD 0.50