Answer:
What is up thatβs also down? Whatβs a smile and a frown?
I can be written, I can be spoken, I can be exposed, I can be broken.
I'm light as a feather, yet the strongest man can't hold me for more than 5 minutes.
Never alive but practically extinct. How we miss the letters pressing the ribbon of ink. What is it?
I am the tool, for inspiring many. Buy me in the store, for not much more than a penny. Don't overuse me, or my usefulness will go.
People take me on walks and I run and have fun. What am I?