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Threema, Facebook, WhatsApp are not open source. TextSecure and Telegram have open source clients allowing for verification and trust of the protocol.

• acdha 12y ago
  If you aren't auditing the binary which is actually running, the open-source distinction is academic for most people.
• electic 12y ago
  Not to mention, the source code on Telegram's website is woefully out of date. There has not been any new postings for a long long long time.