Problem related to FB API and AngularJS (number of likes)

Hello, I've got a problem related to FB API, JS and Angular. I've got some part of code in index.html and I wrote another part of code in file called script.js. There should be 2 functions: first - visibility of buton, second - sending and getting data from Facebook (number of likes and name of profil):
http://plnkr.co/edit/G80gClkiLGr9ZxJpN2sp?p=preview
There're no problems with the first, but I have no idea why the second doesn't work. Any ideas? What is wrong?