Brightkite is essentially like Twitter, but with a major emphasis on localization. With Brightkite you can send messages(as well as photos) from your iPhone and see local messages(and pictures) from other iPhone/Brightkite users.
This is a great social networking application that brings the concept of Twitter, and expands it with things like photos and maps. The only thing that this application is lacking is the wide-spread adoption that Twitter has.
I remember the Whrrl application was sort of like this(even though I think Brightkite has the UI perfect). The thing that will make one of these applications ‘take off’ is the ability to gain a massive user-base. . or at least all of your local friends(depending on if you want to meet new people or stay in touch with current friends).
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