Currently it is not possible to participate in the online community in Super Mario Maker using Loadiine. Once a backup loader surfaces for the IOSU exploit, would it be possible to use the online community? I'm not familiar with how SMM works when it comes to the online stuff. Does it have a database that checks if you've pirated the game? Sort of like a unique serial sort of thing? If so, can it be spoofed? Is it possibly something about Loadiine being too limited? If IOSU grants access to the Wii U in its' entirety, I can imagine it's possible, but like I said I do not have any knowledge of how it works.