Diigo can be included in that list. They have a special educator account that features:
- Student accounts for an entire classroom with optional email addresses
- Students of the same class are automatically set up as a Diigo group
- automatically have access to group bookmarks, annotations, and group forums
- Privacy settings are pre-set for teacher and class access only
- Ads presented to student accounts are limited to education-related sponsors
For more information on setting up, maintaining, and getting additional answers to questions about student accounts, visit the Diigo Education Account FAQ.
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