Best Practices of Creating Contact Sharing Rules?

– Account Org-Wide Default must be set to at least “Public Read Only” in order to set the Contact Org-Wide Default to “Public Read/Write”.
– To share ALL contacts in the system with a group of users or a specific role, create a sharing rule that uses the “All Internal Users” (or “Entire Organization”) public group as the owned by option.
– Use “Roles and Subordinates” over “Roles” where possible to minimize the number of sharing rules.