How Glu knows the link between this account, Twitter and my game account?

Bj4ever17

Like do i have to provide my TSB username each time I post something?? Or do they use your email adress as a reference? Cuz on Twitter its the same as in my game but here, its a different one.

Bj4ever17

Like my ingame username is Dandan2017 email is daniel27leb@gmail.com but its not showing anywhere in my profile info in here.