One of Google's most hidden messaging "clients" is the one built into YouTube. The feature was first privately tested as shared videos in May of 2016, but took more than a whole year to be available to everyone. It was then renamed to Messages and bundled with notifications in YouTube's Activity tab, but remained mobile-only until 2018 when it started showing up on the web. Now, the feature has been officially put on life-support and will be pronounced dead on September 18.
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