We build a lot of dynamic and customizable "Instant Sweepstakes" and contest application were fans can immediately win prizes online. These are great because they give fans instant gratification, but are very complicated to deploy because they have to eliminate fraud (so you don't have a 100 winners) and properly issue prizes to winners. In our latest app for T.I., we've created an ATM-style contest where fans have to guess T.I.'s ATM PIN number for a chance to win a daily prize (prizes go up each day). Fans must first connect on Twitter or Facebook, and then they have twenty chances to guess the correct pin. This mechanism help prevent fraud as well by reducing the possibility of fans creating fake accounts to bypass daily limits.  You can check it out here: http://www.tipaperwork.com/atm

Main screen
Fans are presented with the ATM. When they push a button, they are asked to connect on social media.

Guessing the PIN
After connecting on social media, fans can enter their pin guesses - up to twenty - for a chance to win the daily prize. The application comes with visual and sound effects to help mimic a real ATM machine and enhance the user experience.

Winning screen
Fans who guess the correct the correct PIN are given a custom prompt with a special CONFIRM number we use to ensure they are the correct winner.  Additionally we capture their information (including their IP) to verify the win.