Welcome to Nastazia's WORLD!!!

This week's contest is a Braingle. I will give you a hint and if you are the first person to tell me the answer on the Answer Blog, you will have a page posted on my website all about you!If nobody gets the answer by 2-13-11 I will post the answer and I will include another Braingle.

Braingle

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There were 4 people: Somebody, Nobody, Who, and Everyone.

If Nobody didn't do anything, then Who did. But if Somebody would have done something, Everyone would have been OK. If Everyone would have helped, Who would get the credit. But Who did it....
So, Who did it?