Author of three books on social media and sales. Spoken to over 100,000 people on stages in Canada, USA, South America, India, South Africa and Malaysia. Clients include Ford, Paladin Security, US Department of Commerce.
For contesting apps that drive Facebook users and also can capture additional information (email etc.) we use Offerpop.com for this. Of course any software alone won't cut it.. you need a real contesting and promotions process to use apps like this to help gain REAL likes/users.