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.