Answer:
Once they sailed the sea, now they surf the web
Neither bought nor sold but more valuable than gold. It is built but not by hand. What is it?
White bird, featherless, flying out of paradise. Flying over sea and land. Dying in my hand.
It holds most knowledge that has ever been said. But is not the brain, is not the head. To feathers and their masters, it's both bane and boonΒ One empty, and one full.
I have four wings but cannot fly. I never laugh and never cry. On the same spot always found, toiling away with little sound.
Iβm grown from darkness but shine with a pale light. Very round I am and always a lady's delight.