The Meta app introduced a new feature that allows you to lock conversations by password or recognition. It's an "extra layer of security," which should appeal to those whose phones pass from hand to hand.

The launch of Chat Lock follows accusations of spying via the microphone of some smartphones, last week, as reported by the specialized site Clubic. The platform had assured that it was "a bug on Android". It will also hide message notifications, WhatsApp's parent company added. The feature is "in the process of being deployed" in France.