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XMPP
Extensible Messaging and Presence Protocol is a communications protocol based on XML for real-time exchanging structured data (text, voice, video, data) between network entities.
| First released | 1998 |
| Developed by | Jeremy Miller |
| Open-source | Yes |
| Used by | Google, LiveJournal, Juick |
Interesting facts
Unlike commercial instant messaging systems such as AIM, ICQ, WLM and Yahoo, XMPP is a federated, extensible and open system. Anyone can open their own instant messaging server, register users on it and interact with other XMPP servers.