Answer:
I am an activity involving pins flying in the air.
In all the world none can compare I am a tiny weaver my deadly cloth so silky and fair.
Can not be bought, Can not be sold, Even if it's made of gold. What is it?
I have a hundred legs but cannot stand a long neck but no head and I eat the maid's life. What am I?
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?