Guarana fans simply adore stickers, so we decided to engage them by giving them a chance to create some content for the brand. We launched microsite, where our fans could design their own stickers by combining various pre-defined elements. Each week, fans voted for top 10 stickers that were printed out and sent to their creators. At the end of the contest, fans who got the greatest number of likes were rewarded with valuable prizes and their stickers ended up on Viber.