Facebook Places

Walt Mossberg's most recent All Things Digital blogpost he talks about the new Facebook service called "Places". The service, which is optional for members, allows you to check in to the places you go and share that info with your Facebook friends. It is similar to Twitter's Foursquare network. According to the blogpost, you initially can check in to Places only if you have Apple’s iPhone, though you can use a site at touch.facebook.com via your browser on other phones and laptops that can track your location and support HTML 5 technology.