Answer:
I am the only thing that always tells the truth. I show off everything that I see. I come in all shapes and sizes. What am I?
Digital white-out.
I make things short but I am pretty long myself
You used to come to me for all sorts of information and knowledge before the internet was born
I'm not really more than holes tied to more holes; I'm strong as good steel, though not as stiff as a pole.
No matter how little or how much you use me, you change me every month.