Answer:
Sends paper without using the post office.
A seasonal fashion statement named for the weather it's worn in.
I am the red tongue of the earth, that buries cities.
What can you hold in your left hand but can never hold in your right hand?
Even if you throw it away, it still comes back.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.