MyYearbook, a teen social networking site based in New Hope, PA, has received $4.1 million in its first round of funding. The round was led by U.S. Venture Partners and First Round Capital.
The site was started in 2005 by 17-year-old Catherine Cook and her brother, 18-year-old Dave, who were 15 and 16 at the time of creation. The CEO is older brother Geoff, a 27-year-old Harvard grad. The company says it has about 1.7 million members. Some more details here.