Starbucks helped LivingSocial set a record last week with its $10 for $5 voucher on the deal site, selling 1.5 million to become the highest-selling offer in daily deal site history.

Upstart Business Journal writes that the site sold as many as 67 vouchers per second, bringing in $7.5 million in revenues for the vouchers. LivingSocial communications director Maire Griffin told the publication that the previous record was 1.15 million Amazon gift cards.

Amazingly, Griffin revealed 800,000 deals were sold before email alerts to members were even sent out -- which means social media buzz is largely to thank.

Last week, Reuters spoke with Starbucks' chief digital officer, Adam Brotman, who said that the company's decision to work with LivingSocial shows that daily deal sites can still help some businesses:

"It's an evolving space," Brotman said. "The type of deal, the type of merchant and the implementation of offers are going to be different from circumstance to circumstance."

Mashable notes that this is the second time Starbucks has worked with a daily deal site. In April, it offered the same deal through Google Offers.

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