Recommended hiring practice
Demonstrating to potential candidates that you have an active inbound hiring funnel, and also a pro-active promotion and retention policy of diverse candidates, demonstrates to the extended network of their social connections that your company is serious about diversity, which engenders employees from diverse backgrounds recommending to their social networks your company as a potential employer.
Long winded way of saying “people recommend to their friends your company as a place of employment if those self-same people see that your company is a good place to work for everyone, not just the anointed few due to demographics.”