Explaining Snapchat to a friend whos never tried it can be a challenge, but explaining the ephemeral messaging app to a grown-up is almost impossible. Someday, however, these grown-ups are going to foot the bill for sponsored content or ads on Snapchat, so the company is starting early and sharing an instruction manual with advertisers for understanding the service. Digiday got its hands on the deck, also embedded below, which covers the ins and outs of Snapchat in greater depth than anything else the company has released.