As for the new world and narcissists...hang on, lemme find my hat.
My 14-year-old is very much an internet baby, and I have to poke a little at your choice of the word "narcissists" because I think it's unfair. While we've all seen the pro and con news stories about social media, I've seen it do some wonderful things. The Kid has a real community on line - people living all over the world who share similar struggles, cheer for each other, hold each other's hands when things get rough. And never forget that what looks like narcissism to an outsider may be the result of much angst and struggle for self-confidence.
What's interesting is how flexible The Kid and her friends are about how they communicate. Most of the community formed initially on Wattpad (including some of her IRL friends). Lately they've abandoned Wattpad for Discord. A lot of them are on Instagram. (Very little Facebook and Twitter for this generation - I suspect they find the platforms insufficiently interactive.) They move en masse from platform to platform, depending on what best suits their needs. There's very little brand loyalty; it's all ubiquity, and ease of use. (Skype and Facetime are reliable dinosaurs in this ecosystem, but if video chat gets easier to deploy, that will likely change as well.)
It's all well and good to be grumpy about learning something new (I've poked half-heartedly at Instagram, so I'm definitely one of the grumpy!), or to be bothered by how you perceive people are using it. But if you want your online presence to be effective in any way at all, you need to be discoverable. You need to have a presence where the users are, and it doesn't matter whether or not they're where you think they ought to be.