Plink, which awards Facebook Credits to users who patronize its restaurant and retail partners, announced angel investment of $633,000 on a pre-money valuation of $5 million. Among the participants are digital advertising company Matomy Media Group and angel investment firm Ahlborg Acquisitions.

Plink launched earlier this year, and last week added Arby’s Restaurant Group to its roster of partners that includes 7-11, Dunkin’ Donuts, Quiznos, Red Robin and Taco Bell.

“We’ve attracted a team of innovative and savvy investors who recognize the enormous potential of Plink’s online-to-offline loyalty platform,” said Peter Vogel, co-founder of Plink. “Facebook Credits are proving to be the missing ingredient that bridges the gap between social media marketing and offline sales.”

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