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With this new feature, BlackBerry users will instantly be able to know when and where their friends check in, all without having to leave the app running in the background (and eating up battery life).
This is just one of the new features for Foursquare's BlackBerry app. Push notifications are one way the app is saving on battery life; the company says it made a few other tweaks to ensure Foursquare's app won't unduly drain your battery, as well.
Foursquare also says everything in the app will load faster and touch navigation has been improved.