i haven't, but i am familiar with an expert on the matter, especially in narcissistic personality disorder. if you need some background noise, then this old fart,
Professor Sam Vaknin, has a lot to say about the brain, about human behavior, about the state of current day relationships and, aside from all that, much more to pontificate on when it comes to social media and the deleterious effect it has on the human psyche.
he himself is diagnosed with NPD, because he was completely fucked up by his parents. his IQ was measured very high so they forced him to attend college at 9-years old, and it almost killed him. he had to dissect cadavers in pathology before he was a teenager. having listened to him for many hours i'm of the opinion that he is a genius, and much more eloquent than Jordan Peterson, whom he sometimes shits on with all seriousness and no snark.
be forewarned that Sam uploads
constantly and it's all stream-of-consciousness. he does not edit or curate, only talk about what comes to mind based on the video title. it may feel like he rambles, but you can pick out things here and there. also be especially forewarned that, depending on the subject you look up, he can sound like a massive fucking doomer, the king of the blackpill dispensers.
i recommend watching this video (in the background) to get a feel for Sam himself, and it covers social media, one of his favorite subjects.
and here's a much shorter video on narcissists - in the lens of relationships. he has much longer videos on the topic.