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If this news sounds familiar, it's because Facebook began beta testing the feature among select users back in July.
Facebook-owned Whats App began offering encryption in April 2016, and Apple's i Message and Google's Allo also offer the service. The new feature is based on the Signal Protocol developed by Open Whisper Systems, which is also what powers the encryption behind Whats App and Google Allo.
However, Allo recently came under fire from Edward Snowden, who took to Twitter to urge his followers not to use the messaging platform.
Users don't have to reveal real names, so there's a layer of anonymity.
Because it's anonymous, teens can feel free to be totally candid.