Stressing privacy: The move comes amid debate over the extent to which technology companies should help law enforcement spy on digital communications.
Facebook Inc said it began testing end-to-end encryption on its popular Messenger application to prevent snooping on digital conversations.
The limited testing on Messenger, which has more than 900 million users, comes three months after Facebook rolled out end-to-end encryption to its more popular WhatsApp, a messaging application with over one billion users that it acquired in October 2014.
