hello Salman,
It depends on content that you wish to share in public. I personally avoid showing a copy of personal chat (or any personal correspondence) in forum.
That is, instead of showing a copy of a message, I prefer to write "my friend told me that this keyboard..." or "I got a message from Yamaha, where it's said..." -by doing it that way, a private message written by someone else, becomes my forum message.
Bogdan