Mayor Zohran Mamdani is lifting the ban on governmental use of the social media app, one of a handful that the mayor used to amplify his campaign messaging.

© José A. Alvarado Jr. for The New York Times

Excitement about A.I. assistant tools is running into growing concerns about the security risks of software that operates autonomously on user’s devices.

In his National Cybersecurity Strategy, President Trump sought an expanded role for private firms in cyberwarfare. He did not take on China or Russia in the document.

The San Francisco start-up claimed that DeepSeek, Moonshot and MiniMax used approximately 24,000 fraudulent accounts to train their own chatbots.

The Chinese parent company of the popular video app said a group of non-Chinese investors would create an American TikTok to avoid a federal ban.