If that were easy, we’d have solved email/comment/Twitter/Reddit spam and trolling back in the 1990s. Anyone who has run a service that allows user content of

If that were easy, we’d have solved email/comment/Twitter/Reddit spam and trolling back in the 1990s. Anyone who has run a service that allows user content of any type knows that the miscreants are endlessly creative and you can expend infinite resources but some will slip through. I still see the daily spam and phishing email in my Gmail, despite the tens/hundreds of millions Google has invested in filtering.