Sana Francisco-based Zoosk, the online dating and social networking site, said Wednesday that it has added Jeff Epstein to the company's board of directors. Epstein is currently executive-in-residence at Bessemer Venture Partners, and is a senior advisor to Oak Hill Capital Partners. Epstein previously served as EVP and CFO at Oracle, and CFO of DoubleClick, King World Productions, and Nielsen's Media Measurement and Information Group. Zoosk is venture backed by Canaan Partners, Bessemer Venture Partners, and ATA Ventures. Epstein also sits on the boards of Shutterstock and Priceline.com.