P1.
Allow users to decide level of visibility.
Allow users to control the level of visibility of their personal information and activities.
Edit privacy for a post [Facebook], Account privacy [Instagram]
P3.
Provide controllability for friends and a blocking option against abuse.
Allow users to choose with whom to connect and disconnect, and provide options to choose whether to allow being tagged in friends’ postings. For accounts where abuse can occur, provide a “block” option.
Unfriend [Facebook], Friend request option [Facebook]
P4. Make users aware of the spreadability of their content, and allow them to control it.
Allow users to control the degree to which their content can be reproduced and disseminated without their consent or knowledge.
Allow resharing [Instagram]
