We at DuckDuckGo assure the same anti-tracking policy on our XMPP server. There is nothing greater about DDG then other sites following the same policy :-). But its DDG :-)
http://duck.co/topic/duckduckgo-s-new-public-xmpp-jabber-ser...
See down under the comments, i explained there what is so far logged, but we will tune this now over the next days.