Beware of someone who tells you about how their friends or coworker say nice things about them, as a way to tell you how great they are. But then you never actually meet these people.
You may never meet these friends, employees or coworkers. Or you may eventually you find out that these people actually cannot stand them. You may find out that employees fear them, their family members avoid them, or that their “best friend” has been trying not to talk to them and the narcissist keeps harassing them.
This is one of the ways the narcissist promotes themselves… by telling you what other people say about them. It is more believable for them to tell you what other people say, than telling you how great they are themselves. So they make up things and say that other people say them.
They keep parts of their lives, and people separated so that they can lie about what other people say. They use this to impress you with what other supposedly say about them. They also use this to tell you that others abused them.
So, just be careful about someone who does a lot of talking about themselves by way of telling you what other people think about them. It can be a red flag. See what happens when you ask to meet these people and if the relationships seem to match what they told you.