Answer:
If I have it I don't share it. If I share it I don't have it. What is it?
You write on me and secrets I can keep. In places never seen. I spin like a top. Though stiff as a board I'm often described like a mop.
I have no weight but I could destroy a mansion. What am I?
Better touch me before you proceed to second.
They come at night without being called and are lost in the day without being stolen. What are they?
hide me from your parents if you have done bad academically this year.