Flagr.com Lets You Leave Your Mark on the World
Share where you go, while on the go. Online or from your mobile, place a flag to reveal your location, or keep an eye on your mates, as they leave theirs. A flag is a real-world, geographic bookmark that can have a title, a description, tags, and even pictures. By default, all flags are public, and specifically delivered to the Summary pages of those who count you as a friend. Currently only supported by moobiles in the US....but watch this space...