Can you solve this riddle?

Look in my face and I am everybody.
Scratch my back and I am nobody.
Let me go and so will your luck,
When the timing is right you will be struck.
One walked through me with an open mind,
While others look confused by my design.
Not always there to horrify,
Many more may multiply.
Speak to me, for I say no lies,
I am known as a truth teller, I can't be denied.

What am I?

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