User Sharing - OWD for User Object Winter'14

Problem

I am a manufacturer and I need to include all dealers in my organization while still keeping them from seeing each other.

Solution

Before Winter'14 release, it was not possible. But with Winter'14 release, salesforce has introduced "User Sharing".

User Sharing enables you to show or hide an internal or external user from another user in your organization. Previously, User

Sharing for external users was enabled by default with Communities, while User Sharing for internal users was available through a pilot program.

With Winter ’14, User Sharing is automatically enabled in new organizations. You can:

Set the organization-wide defaults for user records to Private or Public Read Only.
Create user sharing rules based on group membership or other criteria.
Create manual shares for user records to open access to individual users or groups.
Control the visibility of external users in customer or partner portals and communities.

https://help.salesforce.com/HTViewHelpDoc?id=security_sharing_owd_users.htm&language=en_US

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