Extracting information from Google Play API and Apple GameCenter API?

Question

Apple

Given:
- There is a game on Google Play and the App Store. In both games, progress is saved using the same services. There is a desire to create a fan site, but in order to avoid errors in the nickname during registration, because the game is internationalized into all languages, I would like to take data from the API if possible.
- There is also a separate connection to Facebook. I noticed when connecting in the game, on the "friends" page it highlights acquaintances playing with a photo from Facebook, but with nicknames from the game.
Questions:
1) Is it possible to pull a nickname in the game from the Google+ API or another API, where to dig?
2) Do the same with the Apple GameCenter, is there such a thing at all?
3) Is it possible to do this with Facebook, namely to pull the name from another application, and not the user's name in Facebook'e?