ikiMap is a free web service which allows its users to create and share maps. The objective of ikiMap is to combine the concept of a social network with the use of cartography and maps.
Users can create their own maps (by uploading files in KML or GPX format or directly by drawing on the map), vote for other users' maps, add comments, create groups of friends and create their own themed channels.
The homepage of ikiMap lets you browse for saved maps by the most recent, the best rated and the most visited. There is also a search box that can help you locate specific maps, channels or users.