FourSquare you can earn points toward some sort of reward. There are other services like Gowalla and Loopt that perform similarly. The software is free for your iPhone, Blackberry, and some other mobile devices.
There’s yet a newer twist to geolocation with a marketing twist. Advertising Age reports that companies like Proctor & Gamble, Kraft and Citi have been employing this software since December in the name of charity. In other words, the Ad Age article reports you not only check in with your friends, now you can check in with Kraft salad dressing or Gillette razors by scanning the product codes with your mobile phone. Seems bizarre, but people are doing it, as these companies have given over $200K per month to charity in exchange for consumer complicity. Is this a good idea? I don’t know. But if you project into the future and consider Facebook or Twitter in an anytime and everywhere environment – why not? Keep an eye out for this one, or try it out and let me know what you think. As for me, I think I’ll keep my location private.