Nintendo will team with Facebook for a "hackathon" July 28 that has absolutely no hacking in it.
Essentially, Nintendo wants those supposedly smart people behind Facebook to take a crack at using the creation tools in Super Mario Maker. A press release on explains it further:
The Super Mario Maker hackathon is exclusively for Facebook employees to design a special level in the game. At the event, participants will be using the demo version of the game that drew rave reviews at the recent E3 video game trade show to create levels using the in-game tools that will become available to a wider audience when the game launches exclusively for Wii U on the 11th of September. The event will culminate with designers presenting their creations to a panel of judges from Nintendo and Facebook. The winning individual or team has the opportunity to make the level available for Super Mario Maker owners to play after the game's launch.
One of the big things that Nintendo hopes to offer with Super Mario Maker is a robust community of new player-created levels after the game's release. So, this partnership can be seen as a chance to kickstart the levels available at launch.
That all depends on how much you want your Mario levels designed by the employees of Facebook. Surely both will roll out a large nostalgic PR campaign once the competition closes.
Nintendo hasn't denied it, but Super Mario Maker probably won't come with a computer mouse or a fly swatter game.