It's quoted, altough you should try to sign a message using this address, since it's P2SH instead of P2PKH...


Pretty simple: if your account ever gets hacked, the hacker can remove any of your posts where you mentioned an address... By posting your address in this thread, other members will quote you, and an eventual hacker cannot remove the  quoted posts... This way, you'll always be able to prove you were the original account owner in case of a hacking incident.