> Moderation and control have to be designed into the network from the outset.

I wonder about the ability to set up privacy canaries to detect information leaks. Because with stalkers and the like what you are looking for is to make sure that they don't have side channel access to you. So it's not just being able to block them, but block people they associate with. And importantly have ways to detect when they've gotten shared info they aren't supposed to.