With so many apps out for you to tell everyone where you might be, I often wonder if you can find an app that tells you where you will be in the future. You have Facebook with Places, Foursquare, Gowalla, and a handful of others. Which one you choose usually depends on where your friends are. However, unless your friends are active on any of those sites and posting their location, it probably will not matter which one you choose at first.
Disclosure: At Story Institute and MousePad Travel, we receive compensation through iTunes, Amazon, HostMonster, and Google affiliate programs by linking to products. We are independently owned and share only our personal opinions.