That's the app name given to FB servers before generating the secret api key. It's not embedded inside app. It can only be modified via Nokia and who registered the app on FB.
Ofcrse we can change the whole key and link the app to a new registered app, but secret key is encrypted and hardcoded deep inside.

So, good option is using another app/browser and stay away from abusing each other on feeling proud or not.

FYI, every app has that 'via' tag. At least it has a device name, and not only a brand name like "via winpho" or "via samsung"