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Continue to ChatApple: iChat vs. FaceTime (XMPP?) https://wp.jochen.hayek.name/blog-en/2010/10/23/apple-ichat-vs-facetime-xmpp/
Apple: iChat vs. FaceTime (XMPP?) https://wp.jochen.hayek.name/blog-en/2010/10/23/apple-ichat-vs-facetime-xmpp/