I’m Waiting Here is a Google Map based service that you can use to easily point where you are and what are you doing. You can then share this point with your Facebook friends. Using the map you can also see other users' positions and their profiles and communicate with them.
To show where you are you just click on the map at your location and explain what you are doing there. You can then choose to share your point via Facebook. The site also has a number of other features, such as, in site messaging, user profiles, adding friends and photo galleries.