By default, all user stories on the Activity Story Settings tab are set to Always On - Hidden, meaning that users' stories are displayed in the Activity Story Stream and they don't have any option to enable or disable them. However, an admin can change the default for any activity story type that has been enabled as a plugin.
Note that changing the default will not apply retroactively, only from that point forward. For example, if blog posts are currently set to Controlled Opt-Out and users have the option disabled, a change in default to Always On - Hidden will only display blog posts made from that point on - not when the user had them hidden.
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