Online textbook rental company Chegg has acquired Cramster, a social networking site that provides online homework help. Chegg says the merger will help it expand into course planning services.

Cramster’s online study community consists of college and high school students, teachers, professors, parents, and subject matter experts. They contribute information, in a range of subjects, to study resources, including Q&A help, textbook solutions, practice tests and problems, and study groups. The company was founded in 2002 and has more than one million members. Students can sign up for a free or “premium” membership.

Dan Rosensweig, president and CEO of Chegg, said both companies aim to provide students “with value throughout their college experience.... Cramster is the natural fit to expand on our offering." Chegg was founded in 2007; students can access it at and, from the Chegg iPhone app and on select campus bookstores through the Powered by Chegg program.