Jikatabi is a geolocation sharing service. It provides a URL for a map overlaying your files, and you can share it in any way.
Currently, supported input files are GPX and JPEG which has EXIF including GPS information. I hope that it will support KML in the near future.
Front-end, the main part of the map, is my own project `maps.gpx` hosted on Github. Go and try it if you want to make your own site with geolocation.