Yesterday i updates my Lumia 520 and got windows phone 8.1.As i am outside USA s so i got Cortana from the trick describe here . After i got Cortana i installed facebook but i am unable to see facebook on third party list on Cortana. I have also installed several apps that have been run successfully on build but i am unable to got those apps on my mobile in Lumia. So please somebody help me to resolve it and use full function of Cortana