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In what’s being described as one of the largest venture capital rounds in a Portland startup, Janrain has reeled in $33 million in fresh financing from the likes of Millennium Technology Value Partners, Salesforce.com, Epic Ventures, DFJ Frontier and others. Total funding now stands at about $53 million.

The Oregonian’s Mike Rogoway notes that the $33 million round is more than double the size of any investment in a Portland startup last year.

Janrain says that more than 365,000 Web sites – including those for Dr. Pepper, Samsung, Fox Networks and Mattel — have used the technology to allow easier social sign-ins via Facebook, Twitter, LinkedIn and other services. The 8-year-old company, which now employs about 170 people, says that 77 percent of Internet users prefer social sign-ins, and those sign-ins actually help improve conversions by 50 percent.

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