Answer:
It can be cracked, It can be made, It can be told, it can be played. What is it?
People want it, and when they have it, they use it by giving it
When it's dirty this should never be aired in public.
If you have me, you want to tell me. If you tell me, you don't have me.
A standard dimension for sandwiches and rulers
I build up castles. I tear down mountains. I make some men blind. I help others to see.