Here is an alternate version of the USA Basketball Team Picker campaign that incorporates a sweepstakes element.  Our original plan for this campaign involved a sweepstakes component which was removing for timing reasons.

Pick and Choose, Drag and Drop
Key to the success of this application was the intuitive drag and drop interface we developed that allows fans to quickly select their favorite basketball players!  We designed an extremely intuitive control (based on similar projects we have done in the past) that provides wonder feedback on both desktop and mobile platforms and allows users to accomplish the task in a minimum amount of time.

Sweepstakes Component
Users are able to enter a sweepstakes at the end of the selection process.

Sharing on Social Media
You really need to provide users with as many sharing mechanisms that make sense, including those they use most frequently, that's why our platform continues to push the envelop when it comes to sharing rich media content! In addition to direct downloads, Facebook and Twitter, which pretty much everybody does, we also support Pinterest, Tumblr, email (yes people do still use it sometimes) and texting (people use this a LOT).

Rich Media Sharing - How to Communicate Results Visually
Most of our voting and sharing applications are build on the idea that information MUST be communicated VISUALLY on social media for it to have the most impact.  We could have built application that simply generated TEXT output, but we would have dropped the ball on an opportunity to make our message seen as well as hear, which is key to social media success!