Administration of Sphere Ownership
Spheres are controlled by the owner (the person who creates the Sphere). In some cases, the owner may want to transfer ownership of the Sphere to someone else.
This privilege is available only to those sphere owners with the Sphere Administration permission in the NewsGator Social Platform service. For further details, see Permissions for global capabilities section.
Users who have this privilege get an additional Administer tab in the Spheres management UI.
Administer tab
On the Administer tab, you'll see the spheres you own. The far right option is to Change Owner. When you click this icon, it brings up the people picker control to pick the new owner.
Click Save to transfer ownership
Click Save to transfer the ownership.