What does qq plus friend source verification message mean?

A message to verify the identity of the other party.

QQ plus friend source verification message means that when adding friends, the added party will receive a verification message asking the other party to provide their own identity information or verification information to confirm the other party's identity. This is a security authentication mechanism designed to protect personal information. By verifying the message, you can ensure that the friend you added is someone you know or trust. We should also be vigilant to avoid being cheated of personal information and ensure the authenticity and legality of the verification message.