Twitter’s decision to notify users when their accounts are targeted in state-sponsored attacks earned its share of praise. But Twitter’s silence in terms of specifics about the attacks—whether by choice or gagged by a National Security Letter—has foisted some anxiety upon those who were notified. A few of the estimated 50 recipients happened to be...

Yahoo has announced it will follow in the footsteps of Twitter and Facebook and begin warning users when it believes their accounts have been targeted by a state-sponsored actor. Bob Lord, who was hired as the company’s new CISO in October, discussed the initiative in a blog post Monday. Lord said Yahoo will only notify users...