Its a great app, i use this to communicate with my classmates and teachers we have gc, tho i cant log in to my account it says i need the code or something, tho the authentication code didn't sent, please do something about it, i cant log in to my account thats why i use fb is because of my school thingy. Please do something about your security, its cool that your users account is safe but it just doesn't work the way it should've.