That's one possibility, but pseudonmyous is the default on Twitter now unless you pay for the privilege. It's a tricky problem. We want some degree of anonymity

That's one possibility, but pseudonmyous is the default on Twitter now unless you pay for the privilege. It's a tricky problem. We want some degree of anonymity but that also invites abuse. We need something like a zero-knowledge proof of citizenry, at the very least.