no, but Notches page is....
No, Facebook does not have minecraft.
you can upload a screeshot of your game to facebook from the pause menu.
Yes there is such thing as the Ether World in Minecraft.
An underwater world seed for Minecraft is used to open an underwater world to play the game in.
Sorry it's probaly not possible ):
Yes, Minecraft is global.
No
yes there is cafe world on facebook
Place the world in your minecraft bin's saves folder.
It is not a seed, it is a world download. Look up dropper world download on google or minecraft forums
You create a world and go into the world in minecraft.
Any world on Peaceful........................