Oh nice. For a test project I installed a #telegram app on a tablet with an empty #adressbook only to find out that it send out that information to obviously every Telegram user that had my number in their adressbook. How illegal...

And that happened BEFORE I could adjust any settings during the setup. I dont think I just missed that, but that is a big fail. It's been a while, but does #Signal do the same? I hat such practice.
#securemessenger #security #dataprotection