"What can a social scientist learn from studying the special purpose map that you created?"

A social scientist will look for political and social relations of the map you created. Depending on the content, this social scientist will find other information, because he/she can look at the map based on his/her political and social academic background.

Explanation:

Now let's understand better. A social scientist studies the social and political relations/structures in society. Not only that, the culture and the building of identity is also a field of study very profitable. So, depending on the content on your map, a social scientist will look at it and will identify:

The cultural relations that, one way or another, develop the identity of a people;
The social conflicts that will shape that group or society;
The social structure of that group, understanding the hierarchy that would exist there.

And several other aspects, but those cited above are the relevant ones, and the first ones a social scientist will look for.