Fun games could be made – “identify nationality by face” and “identify language by audio recording”. A person’s photo is shown, along with answer options. Or they let you listen to a phrase, and you need to determine the language. Of course, it is not entirely legal to use other people’s photos for this, but what Facebook app or Vkontakte app doesn’t do that. There are perfectly legal photo banks. For audio, there are plenty of voiced books in various languages in the public domain. This would be an interesting thing. And seemingly simple to make.
Users could be allowed to upload their own photos and get statistics on which nationality other users identified them as. I think many would find this interesting, and the bank of available photos with “correct answers” would only grow.
Hi, I'm Rauf Aliev. 