Wrapp, a social gifting app that lets users send digital gift cards from their smartphones, has raised $15 million in Series B funding. The round includes investments from Series A investors Greylock Partners, Atomico, and Creandum, as well as new investors Qualcomm Ventures, American Express, and SEB Private Equity.

Wrapp will use the Series B funds to continue expansion, including hiring staff for its U.S. operations in San Francisco, says the company.

Founded in 2011, Wrapp is based in San Francisco and Stockholm.

Since May last year, consumers have used Wrapp’s iPhone and Android apps to give people nearly 15 million digital gift cards, says Wrapp.