WikiTree has a uniquely balanced privacy system. It's based on Trusted Lists.
Every profile of a person, place, or thing has its own Trusted List. Like with "Friends Lists" on social networking sites, each user on a Trusted List has to be individually approved.
You approve or reject users for your own profile's Trusted List. Profiles of non-living or inactive family members and friends along with profiles of places and things are controlled by the users already on the Trusted List. They have the right and responsibility to decide whether other users can join their group and view and edit the full profile.
You can ask to be added to a Trusted List by clicking on the link on the profile.
See also: Watchlist, Trusted List FAQ.