And building a thing where you massively increase their reach is a decision, yes. As an example, it could be Nextdoor-y[1], bound to physical location rather t

And building a thing where you massively increase their reach is a decision, yes. As an example, it could be Nextdoor-y[1], bound to physical location rather than global. And that's not a stretch either: it's what Facebook was in the early days. They decided to change it, to become what it is now. [1]: I do not in any way mean to imply Nextdoor is doing things right, just showing that "social network structure" is a decision, not some kind of inevitability.