Online market researcher Vizu has raised $6.75 million in equity financing from iNovia Capital and Greycroft Partners. Previous backers, including Draper Fisher Jurvetson and Esther Dyson, also participated in the financing. The San Francisco company, which raised $2.9 million nearly three years ago, plans to use the proceeds from this latest round to hire additional sales staff and build out its technology platform. As display ads show signs of a comeback, Vizu believes that its promise of measuring the effectiveness of online branding campaigns might hold greater interest to marketers and media agencies. Release