I imagine it's a mix of all that. I'm only in my late 20s. I remember in my early teens, when internet access was still mostly something done at a desk and givi

I imagine it's a mix of all that. I'm only in my late 20s. I remember in my early teens, when internet access was still mostly something done at a desk and giving children a cellphone with service was not as common, I had a large vibrant friend group whom I used to spend a lot of time with. Though in hindsight I don't really remember it fondly since the friendships were kind of toxic and not as deep as with my 2-3 current friends. During college I didn't really make friends, mostly just saw them as acquaintances since we mostly didn't really have much in common. I only really interact with my current friend group over the internet and we've been sharing almost everything with each other for pretty much every waking moment for the past 5-6 years. I consider this to be fulfilling my social needs pretty well, particularly since I'm not all that outgoing in the first place. What I am missing out on are ancillary benefits of physically present friends, like being able to ask them for favors.