This one didn't get much play but I think it's an incredibly innovative use of Snapchat.  

ASP, the Association of Surfing Professionals, has been doing some really innovative stuff - and experimenting with their social strategy.  Take this idea for example: Last month they had the 2013 ASP Rookie of the Year, Nat Young, running a digital autograph session on Snapchat. Nat (and apparently a few other more famous surfers) personally replied to fan's snaps with a selfie and signature, drawn on the picture using one of Snapchat's built in features.

Of course happy fans then posted screenshots of their individual autographs on Twitter, sharing their Snapchat experience with friends across other social media platforms. Boom.

What a Simple, Smart and Social way to engage your audience.  Easy too!