(2004-02-11) Flickr

FlickR is an Instant Messaging application for sharing media among your Social Network. I don't know whether it uses any pre-existing protocols like Jabber or WASTE...

Update: non-standard stuff - From a technical standpoint, FlickR is built on Ludi Corp's existing engine technology, which means it's a Flash front end communicating with a J2EE back end using an XML-based protocol.