Scribblenauts Unlimited Will Use Nintendo Network to Exchange Objects
A 5TH Cell representative has confirmed that Scribblenauts Unlimited for Wii U will use the Nintendo Network to share objects created with the games Object Editor. The 3DS version however will not have this feature or any online interaction at all. The game will have StreetPass functionality though which allows players to share puzzle solutions with one another.
Scribblenauts Unlimited is a Launch title for Wii U, the 3DS version releases sometime this December.