The question then becomes how can you make a website with all your friend (and by association all their friends) make enough profit to run itself?
(If we hit the stretch goal, we can upgrade to a raspberry pi!)
Said little sites may run for a bit and die, and the massive monolith remains, at least until another monolith replaces them.
I suspect in just a few more decades, we shall reinvent the 90s and 2000s p2p networks from first principles.
They worked great when most actors were well behaved and got abandoned pretty quickly once that changed.
There's a p2p network I use today which doesn't have that problem, probably due to its small size. Meanwhile all the big platforms do — including this one!