Answer:
Used left or right, I get to travel over cobblestone or gravel. Used up, I vie for sweet success, used down, I cause men great duress.
It is worldwide, but once only a spider could weave one
When I get closer my tail grows longer, but when I go away my tail leads the way.
What is given but kept by the giver?
Come up and let us go. Go down and here we stay
I start with T end with T and within me is T.