Facebook Messenger: why a cyber security expert is urging you to delete the app. (PA) CYBER security experts have issued an urgent warning to anyone who uses Facebook Messenger. Messenger, operated by Facebook, which also owns WhatsApp and Instagram, is one of the most widely used messaging apps in the world. But writing in Forbes this week Zak Doffman, CEO of Brit surveillance tech firm Digital Barriers, warned that Facebook Messenger is not protecting its users from hackers. According to Doffman, key security updates on the popular platform have been delayed and has called on users ...