* **Summary**: Social networks that are not open to people outside of family, friends, neighbours, or co-workers. Non-work-related examples include Couple, FamilyWall, 23snaps, and Nextdoor. Some of the larger social network platforms enable closed communities: examples are Instagram Close Friends and Twitter (X) Circle. Work-related examples of private social networks include LinkedIn, Facebook Workplace, and enterprise communication platforms such as Slack or Microsoft Teams.