You could create a group "all" which is private - hidden - no tags.
Every user is member of this group. So you cloud mention the group @all where all users are members.
We are planing to use this forum in a project here in EU. Due to EU law we need to be able to:
This is not a common case but the option need to be there so are their plugins for these, built in or do I need to attack the database directly to manage this?