Deployments
Several large public IM services natively use XMPP, including Google Talk, Facebook chat, and LiveJournal's "LJ Talk", Nimbuzz, and Ovi (Nokia). Various hosting services, such as DreamHost and GMX, enable hosting customers to choose XMPP services alongside more traditional web and email services. Specialized XMPP hosting services also exist so that domain owners need not directly run their own XMPP servers, including WebEx Connect, Chrome.pl, Flosoft.biz, i-pobox.net, and hosted.im.
XMPP is also used in deployments of non-IM services, including smart grid systems such as demand-response applications, message-oriented middleware, and as a replacement for SMS to provide text messaging on many smartphone clients.
Read more about this topic: Extensible Messaging And Presence Protocol