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Big investors backing doctor-booking site ZocDoc

The Founders Fund leads a $15 million Series B round for the ambitious start-up, which runs online doctor appointment booking in four U.S. cities and hopes to expand to more.

A New York-based start-up called ZocDoc aims to expand its service of online doctor and dentist appointment bookings with a $15 million Series B venture round led by the Founders Fund. Existing investor Khosla Ventures also contributed.

The money will be used primarily to help ZocDoc expand geographically. Currently operating in New York, San Francisco, Washington, D.C., and Chicago, the company is soliciting users to vote on what its fifth city should be (the options include Boston, Los Angeles, Philadelphia, and Seattle). But expanding requires complicated groundwork: ZocDoc aggregates participating doctors; lets users search for them by availability, location, and insurance plan match-up; and then enables users to book appointments online. The service is free for users. It's a big change from the status quo.

But big names have faith in ZocDoc's ambitious model. Its Series A round included investments from Salesforce CEO Mark Benioff and Bezos Expeditions, the firm headed by CEO Jeff Bezos. And two-time contributor Khosla Ventures is the firm led by Sun Microsystems founder Vinod Khosla, who has been focusing his investments on clean technology and health care, with the likes of a $1 billion green-tech fund and a personal investment in EcoMotors that was just announced this week.

The Founders Fund is no exception: among its principals are PayPal co-founder Peter Thiel and entrepreneur Sean Parker, who may well become a household name when Justin Timberlake plays him onscreen in this fall's debut of "The Social Network."