A system and method of identifying users of a multi-tenant database and application service is provided. The system and method is configured to generate a list of contacts from a contact database of a multi-tenant database and application service. Each contact in the list of contacts is sent a message that includes a link to web site that includes a query. Specifically, each contact visiting the web site is queried to determine if the contact is a user of a multi-tenant database and application service. Additionally, contacts are queried to determine if they are an administrator user, and if not, who is an associated administrator user. The contact database is updated to indicate contacts that are users of the multi-tenant database and application service when approved of by the associated administrator.