Today, Offerpal launches Offerpal Tasks, where social gamers can earn virtual currency without paying for it. Instead, they can choose from around 100,000 simple online tasks to complete via Amazon Mechanical Turk for virtual currencies in their favorite games.

Indirect payments, such as Offerpal Tasks, are playing a larger role in the growth of virtual currency. It’s been estimated that between 30-50% of virtual currency payments in social gaming come from indirect methods.

Sample tasks include rating search results, categorizing web sites or articles, and answering questions. Offerpal Tasks are now available throughout Offerpal’s network of more than 2,000 web sites and applications.

The new service will allow online gamers to select from thousands of ‘Human Intelligence Tasks,’ work whenever it’s convenient, and convert their earnings into virtual currency that can be spent in online games and virtual worlds. “We’re pleased that Offerpal has chosen to leverage Amazon Mechanical Turk for their ‘Tasks’ service,” said Steve Rabuchin, General Manager for Amazon Web Services.