You don't need to know my credentials to determine that this information is true, but yeah - I do have a lot of experience with teenagers between 13-19, and anyone who also does will know what I'm talking about.
This isn't some stupid "generation-gap" bullshit either. Don't even go there, because you know it's affecting us all. But if you don't remember the primacy of print media, then you don't know what it was like to live in a world of words.
We had to use them to make things. Always. Everyone. There was not just the shadow of the book that was pointed to when justification was required, but the actual book of words that you were expected to write. Metaphorically, that is. If you wanted to express a timeless experience, with the intention of inscribing it into eternity, then your best bet was words. Carve 'em in stone. They'll be there in a few thousand years, guaranteed.
That shit ain't true anymore. Check the Last Jedi - books can be burned, mah Jedi. Words ain't shit. They don't even mean one thing necessarily, as the arguments over translation and original authorship throughout the past entire history of the written word will attest to. That's a real bitch. Polysemeity guarantees that's going to always be true, too - there is no human language with a 1:1 ratio of sign to signifier, if DeSaussure is to be trusted (I'm posting this on Veeky Forums, so you have to expect some academic dick-swinging, right? But it's also a universal truth, so you should look that up if you don't catch the reference. Just google "Semiotics").
Point is, we have entered the world of the image. Officially. Literature is no longer print-based. That really happened a long time ago (cf. Marshall McLuhan), but the lived experience of this boom is only now entering the echo of self-awareness. That is, only now is it that video is being expressed as an immediate rhetorical response on a constant daily basis.
Snapchat is the obvious culprit, but they're just the brand-name that happened to take hold; it was an historical inevitability.
The consequences of this are both harrowing and multifaceted on physical, mental, and spiritual levels (or "PMS," I suppose it would be...), so I'm up for a long discussion, if anyone is interested in it.