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Lockerz boasts more than 19 million members of its social shopping service. But until today it was largely a Web-based experience.

That’s changing with the company’s introduction of a free iPhone app, a mobile experience that will allow users to earn the company’s virtual currency, PTZ, while on the go.

Founder Kathy Savitt said that the iPhone app has been a long requested feature.

Like the Web site, users of the app can earn PTZ for sharing content, uploading photos and answering trivia questions. The virtual currency then can be used to received discounts at retailers.

Lockerz, which targets its service to those between the ages of 13 to 30, scored a $30 million round of funding earlier this year from Liberty Media, Kleiner Perkins and others.

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