Answer:
I have many feathers to help me fly. I have a body and head, but I'm not alive. It is your strength which determines how far I go. You can hold me in your hand, but I'm never thrown.
What can you share and still have all for yourself?
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
Once they sailed the sea, now they surf the web
I sleep by day, I fly by night. I have no feathers to aid my flight.
People take me on walks and I run and have fun. What am I?