“EVERYONE AGREES that child exploitation material should be off the Web. The trouble is actually getting rid of it. The New York Times writes that technology companies last year reported 45 million online photographs and videos of minors, including infants and toddlers, being sexually assaulted and in some cases even tortured.

The startling surge results in part from inventions that make images simple to disseminate and complicated to detect. This is society’s chronic Internet-induced headache: We’ve opened up the world, and that comes with horrors as well as wonders. But the spike also represents an increase in successful policing by platforms — which is better news. Still, there’s a long way to go.”