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Facebook Messenger.

• jhasse 10y ago
  It's rather a web app than a desktop application, isn't it?
  • hn159753 10y ago
    It's not a desktop app, but the original requirement never stated that.
    • akjainaj 10y ago
      There's a desktop app for Windows. There's also a web app at https://messenger.com https://messenger.com. You can disable your Facebook account and still use Messenger
• rand77763 10y ago
  Wait, are you saying messenger is secure and private? As if Facebook would want to give up a source of data for marketing?
  • tptacek 10y ago
    It's opt-in end-to-end encrypted with Signal Protocol now, so Facebook does in fact give up that data. Having said that, you should prefer protocols that aren't opt-in for security, which is what Signal buys you.
• FabHK 10y ago
  Is Facebook Messenger Signal-based (i.e. end-to-end encrypted with a Signal/Axolotl double ratchet) as GP requested? I somehow doubt it. EDIT: Oh, I was mistaken, apparently there is an option now. From Wikipedia: On October 4, 2016, Facebook deployed end-to-end encryption as an optional feature for Facebook Messenger users. It is available in an optional mode called "Secret Conversations" and uses the Signal Protocol.