The Business Control Center allows you to create folders for user segments. The user segment sharing feature in Experience Manager, however, does not differentiate by folder, so the following two segments would both appear as YoungMales in the Add/Modify User Segments dialog box:

/RepositoryGroups/YoungMales

/RepositoryGroups/mySegments/YoungMales

For this reason, it is important to use a unique name for every user segment you create in the Business Control Center, regardless of its location in the user segment folder structure.