Answer:
My first is second in line; I send shivers up your spine; not quite shining bright I glitter in the light.
I can travel from there to here by disappearing, and here to there by reappearing.
Look into my face and I'm everybody. Scratch my back and I'm nobody.
The one who makes it, sells it. The one who buys it, never uses it. The one that uses it never knows that he’s using it.
What can you put in a barrel to make it lighter?
I am your mother's brother's only brother in law. Who am I?