The technical side of it is a solved problem. Everything you look at is hosted on a web page. You get a URL that points to it. You send the URL to another person and they can reach it, maybe with some additional stuff for time-stamping and chapter breaks and such. For bonus stuff you can include some account management for each user to be able to interact with the content but it’s not necessary and doesn’t need to gate you just being able to watch the thing.

The problem emerges when companies need to monetize the hosting and delivery of the content. It’s 100% a business model challenge, not a technical one.

yup my current most common method of 'socializing' digitally is me taking a screenshot of something interesting on my screen and sending it over some chat service (depending on who i am sending it to)

if i could open a screen share session with a similar easy shortcut, and broadcast whatever i have open on my screen with my friends, regardless of where the pixels originated, with a full duplex link i could talk over / see my friends with, i think i'd have much more meaningful evenings