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A comment on Threema – Secure and Private Messenger. Parent comment

Re:Threema – Secure and Private Messenger by sradman on Thursday January 21, 2021 @11:15AM (#25860453)
GCM is Google Cloud Messaging [1] used for push notifications on Android and Chrome.

> It has been superseded by Google's Firebase Cloud Messaging (FCM) on May 29, 2019.

[1] https://en.wikipedia.org/wiki/Google_Cloud_Messaging

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