Can it not be "make something"?
Yes, and I reported it.
Didn't work for me; will also report it. Feb.26.15
Make is for something that needs to be prepared, like food or drink, for example. In this case, we are talking about an action, so, Do is better.
But one could be saying, "I am hungry" and another person says, "Make something.". So, I think both should be correct, especially without context.
When do you use faça vs. faz for imperative?
they are the same. Faz for tu and Faça for você. Faz is more common where I live.