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var client = new xmpp.Client({
	jid: '-123456@chat.facebook.com', // where 123456 is the users facebook id
	api_key: apiKey, // api key of your facebook app
	secret_key: secretKey, // secret key of your facebook app
	session_key: sessionKey, // users current session key
        host: 'chat.facebook.com'
});

// you can find more details here http://developers.facebook.com/docs/chat/