In his article Sunday in the Chronicle of Higher Education, Jeffrey Young comments:
[Pooja] Sankar, a recent graduate of Stanford University’s M.B.A. program, leads a start-up focused on finding a better way for college students to ask questions about course materials and assignments online. Her company, Piazza, has built an online study hall where professors and teaching assistants can easily monitor questions and encourage students who understand the material to help their peers.
At first blush, the service seems unnecessary. Students can already e-mail questions to professors or fellow students, and most colleges already own course-management systems like Blackboard that include discussion features. But Ms. Sankar feels that such options are clunky. She says professors are finding that Piazza can save them hours each week by allowing them to post answers to a single online forum rather than handle a scattershot of student e-mails.
Piazza is a Web site that refreshes with updates as new questions or answers come in. Professors simply set up a free discussion area for their course on the service at the beginning of the term and invite their students to set up free accounts to participate. Ms. Sankar says that students typically keep Piazza open on their screens as they work on homework, often staying on the site for hours at a time.
For more information, including a Piazza tour and demonstration version, see here.