Often you can tell how serious someone is about diversity when you ask them what the most difficult characteristics of team members are. Then there is the question of what characteristics the managers find easy to work with.
The answers are about whether the person primarily describes people like him or her. That's a clue about how interested the person (and their company) really is in adjusting to different cultures.
Social media often gives other clues – are potential superiors confined to their social bubbles, or do they follow very diverse people?
That's true especially if the company operates in some exotic key markets. The cultural values of a certain person may be very similar to those of the customers.
For example, African Americans and Latinos care deeply about their extended families and communities compared to Caucasians. This cultural value is called collectivism and is shared by 70 % of the world.
So in certain situations it's very convenient to have somebody in the team who fully understands this value and its implications.
-jk-