These are special premium accounts provided specifically to K-12 & higher-ed educators. Once your Diigo Educator application is approved, your account will be upgraded to have these additional features:

• You can create student accounts for an entire class with just a few clicks (and student email addresses are optional for account creation)
• Students of the same class are automatically set up as a Diigo group so they can start using all the benefits that a Diigo group provides, such as group bookmarks and annotations, and group forums.
• Privacy settings of student accounts are pre-set so that only teachers and classmates can communicate with them.
• Ads presented to student account users are limited to education-related sponsors.