If you support XMPP/Jabber you automatically support Google Talk and Facebook and several other services.
Mark Kubiak commented
Hi, I suggested an Extensions system. I think this would be better than support for one protocol, so third parties could develop whatever they need. Tell me what you think: https://fsn.uservoice.com/forums/200650-general/suggestions/3980352-have-an-extensions-system-that-allows-users-to-dev
Christopher Theofilaktos commented
Google talk would be great for international users. Faceboook, as much as I hate it, would also be good because everyone uses it.
Aaron Fletcher commented
Google talk integration is a must for me
Craig Devine commented
+1 for the google talk. Give the international people some love.