This module adds an interactive #map of #locations for all kinds of content like profiles, events, videos, timeline posts, etc. Anything that supports #location field. It allows members to filter locations by types. All locations are clickable. Alternatively it can be configured to show only one type of locations (lets say #online members only) and in this case the filters section will disappear automatically, so the entire map will be showing locations of online members only and nothing else.
Also you may be interested in Nearby People module which shows a real time location of online members and in Location Picker module which allows to use Location field without having to use Google Maps.
The Locations Map module shows only what is already stored in a DB. If nothing shows then this means that there is nothing in a DB, i.e. locations aren't set for any type of content.
A content entry must somehow get its location defined. In UNA 11 out of the box this is being done using the Location field which relies on Google places API.
If you for some reason can't use Google services then there is an alternative: Location Picker module which provides an interactive map in place of a Google driven location field on all content add/edit forms.