Here's a quick and inventive idea for you to run a contest on Snapchat, courtesy of GrubHub. Take a look at its "Spot the Bacon" Snapchat story:

It offered 10 fans the chance to win $50 of GrubHub vouchers by challenging them to spot and screenshot the word "bacon" in its story, then e-mail their pic to be entered. A selection of different t-shirts appear in quick succession for users to screen grab, and the effect is easily created by stitching together several short snaps to create a Snapchat story.

What do you think? Will you be trying this tactic out with your own Snapchat fans?