Up until the early 00s, I used to hang out at a coffee/cigarette bar where I knew just about every single person who walked through the door, and people would sit there for hours and hours talking to strangers about very interesting stuff, while drinking insane amounts of coffee and chain smoking.
If those sorts of places still exist, I have no idea where they are.
I used to get breakfast every Thursday with a one legged motorcycle courier (still have no idea how that worked) who fought in the gulf war, an HSBC executive and a fishmonger. I miss that.
I have kids now and other parents are horrible people.
It's still a bit expensive at the moment though, as it requires smartphones with a decent front camera and fast connectivity, but early results are encouraging.