Within the next 10 years, and maybe much sooner, the vast majority of content on FB/Twitter/Reddit/LinkedIn will be completely fake. The "people" on those networks will be fake as well. Sure there are bots today, but they're not nearly as good as what I'm talking about, and they don't exist at the same scale. Once that happens, the value of those networks will rapidly deteriorate as people will seek out more authentic experiences with real people.
IMO, there's a multibillion dollar company waiting to be founded to provide authenticity verification services for humans online.
On the flip side, successful startups that aren't full social but do require some authenticity verification have already been proven: nextdoor and blind, for example
I think the biggest issue is scaling to a facebook-style, reddit-style, or twitter-style "full-world" social network implies colliding people who have no other relationship or interaction but are linked through a topic or shared interest
And, in my opinion, when you hit a certain level of scale, the verification almost becomes pointless: there's enough loud angry and troll people out there that I dont think it matters if they're verified or not. You can't moderate away toxicity in discussions that include literally a million participants.
I think you need both verification and some way to keep all the users' subnetworks small enough that it isn't toxic or chilling. But then you lose that addictive feed of endless content that links people to reddit or Facebook or Instagram. Tough problem
In my opinion HN is the gold-standard of online communities and it's being managed pretty well despite it scaling to what it is right now.
I wonder more leanings from HN (specially on the moderation front) can be applied to newer social platforms.