XmppClient xmppClient = new XmppClient();


xmppClient.OnBeforeSasl += xmppClient_OnBeforeSasl;
xmppClient.OnError += xmppClient_OnError;

xmppClient.Show = Matrix.Xmpp.Show.chat;
xmppClient.SetXmppDomain("chat.facebook.com");
xmppClient.Port = 5222;
xmppClient.ProxyType = Matrix.Net.Proxy.ProxyType.HttpTunnel;           
xmppClient.ProxyHostname = "localhost";
xmppClient.ProxyPort = 4503;

xmppClient.Open();


private void xmppClient_OnError(object sender, Matrix.ExceptionEventArgs e)
{
    gui.Dispatcher.BeginInvoke(() => MessageBox.Show(e.Exception.Message));
}

private void xmppClient_OnBeforeSasl(object sender, Matrix.Xmpp.Sasl.SaslEventArgs e)
{
    e.Auto = false;
    e.SaslMechanism = Matrix.Xmpp.Sasl.SaslMechanism.X_FACEBOOK_PLATFORM;

    e.SaslProperties = new Matrix.Xmpp.Sasl.Processor.Facebook.FacebookProperties
     {
         ApiKey = applicationKey,
         ApiSecret = applicationSecret,
         SessionKey = browserSession.SessionKey
    };
}