Answer:
Look into my face and I'm everybody. Scratch my back and I'm nobody.
Stealthy as a shadow in the dead of night, cunning but affectionate if given a bite. Never owned but often loved. At my sport considered cruel, but that's because you never know me at all.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
The one who makes it, sells it. The one who buys it, never uses it. The one that uses it never knows that heβs using it.
Different lights do make me strange, thus into different sizes I will change
Which popular cheese is made backwards?