Answer:
You used to come to me for all sorts of information and knowledge before the internet was born
When I come in from sea to shore twenty paces you'll see No less no more.
Draw fire or fill me; I'm still empty.
Without me everyone would lose their head.
They are many and one, they wave and they drum, used to cover a stare, they go with you everywhere.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.