Answer:
I am what bring things together. Without me everything you see would be a total mass or debris everywhere.
I am bought by the yard but worn by the foot
lighter than feather and softer than silk yet the strongest man in the world cannot hold me for more than a few minutes.
The Titanic is still here. What am I?
I'm sometimes white and always wrong. I can break a heart and hurt the strong. I can build love and tear it down. I can make a smile, but more often bring a frown. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?