The old places where we met when we were 15-20 are almost empty. The new place, HN being one of them, have been willingly sacrificed to the making of money. And then there are places like FB, Instagram that aren't really places of finding, more the spam mailbox turned into a feature.
Last but not least there are these isolated group meetings in whatsapp, slack etc. But there I've only found ones that are mostly open and therefore lack the finding part. You really need to know what you are looking for to have any chance of finding such hidden places.
So where's that "finding your people online" place nowadays?