Educators should collect parent permission when creating student accounts. See the paragraph below from our Terms of Service (http://code.org/tos):

"If you are an Educator and you register an account for a student who is under the age of 13 (a “Child”), you represent and warrant that you or the educational organization you work for has proper permission to register the Child for educational services, such as Code.org, that collect some of the Child’s personal information for the use and benefit of the school and for no other commercial purpose. In addition, you agree to be bound by these Terms on behalf of the educational organization you work for."

Here's a handout that can be sent home to parents explaining Code.org:  http://code.org/privacy/student-privacy