Answer:
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.
I hold two meanings. With one I may be broken, with the other I hold on. What am I?
I have roots nobody sees. I am taller than trees. Up up I go but I never grow.
A trail, a union, together tied. Come across me and you will find you cannot change the course I'm on. Without me you cannot travel on. What am I?
I am a word. I become longer when the third letter is removed.
I spend most of my day eating white. When I am quick enough I get rewarded with fruit and something blue. In a dark room with blue walls I run from the ghosts that roam the halls