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When I installed Telegram for the first time, people in my address book saw me and wrote me. How did that happen?

• maqp 6y ago
  Because Telegram uses phone's contact list for contact discovery. There's nothing unusual about this. This how Signal, Riot, Threema, Wire and dozens and dozens of messengers work.
  • Krasnol 6y ago
    So just like Signal? Why is that being brought up as difference?