You know about Twitter, now check out Tweet What You Spend, the application that answers “Where does my money go between trips to the ATM?

A great example of how to build an app that piggyback’s another application’s popularity. This is great functionality that could be added to personal bookkeeping software like Mint. It will be interesting to see if Twitter moves from the fringes to the mainstream as more practical applications such as this are developed for it.

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