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ByteDance won't sell TikTok, would rather pull it from the US
(www.androidauthority.com)
This is a most excellent place for technology news and articles.
*allegedly
No one knows for sure, since WhatsApp is proprietary
So are Signal's serverside components.
Uh, no? I don't know who told you this lie, but https://github.com/signalapp/Signal-Server
Btw it wouldn't even matter, since the encryption happens in the client app. The server basically just passes around encrypted pieces of data between devices.