Video metrics provider Visible Measures has raised additional — and undisclosed — funding for its third round from DAG Ventures, the company said. Back in March, Visible Measures, which has offices in Boston and San Francisco, raised $10 million from Northgate Capital, which led the round. Previous backers General Catalyst Partners and MDV-Mohr Davidow Ventures also participated. The company has planned to use the proceeds for marketing and product development. In addition to the funding, Visible Measures has made the hiring of Tom Brennan as CFO official. Brennan told me that he took on the post in July. “When Visible Measures first raised the third round earlier this year, they left some room open in case the right investor came along,” Brennan said.