Though I might add, that younger generations have a wast different experience what the web and _beeing online_. Is for us beeing online was not a omnipresent. When you log off icq you are simply not available. Very different to Facebook messenger / WhatsApp imho.
Not saying that we are not living in the same world today but the way to experience the web is different.
But also I was for many, many hours on phone with friends (unlimited minutes). So, I'm not sure that changed much
The tech-literate millennials definitely still shared the tail-end of the internet that gen X was familiar with. However there is also a big part of our generation that only really experienced the web through social media starting in their late teens or early twenties.
You're an older millenial. Barely one, as a matter of fact.
The folks born 10 years after you were are in an entirely different headspace.
I was born in 1990. Facebook is not my Internet. When I grew up the Internet was a very fascinating place. Flash games, web forums, chat rooms, peer to peer file sharing of mp3 files and movies. A friend of mine had an older brother who used to give him home burned CDs with software, anime, games and other files, that the older brother had obtained via Suprnova.org and other torrent tracker sites. And me and my friends also downloaded and shared files using BearShare, LimeWire and KaZaA Lite.
So no, I can not agree with the overly simplistic characterization of millennials as thinking that Facebook is the Internet.