Boxcar for iPhone sends you push notifications anytime someone mentions you on Twitter, or sends you a direct message. http://boxcar.io/
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Birdbrain is an iPhone application that tracks changes to your friends and followers list on Twitter. http://ping.fm/GLo6a
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qTweeter lets you tweet and update your Facebook status like never before from your iPhone or iPod Touch. http://unhub.com/XA9h
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