When the iPhone first started becoming popular, users had limited choices when it came to Twitter applications. But now, there are myriad services that allow you to blast 140-character tweets, and keep up with your buddies, too. So now, the problem is weeding out the pretenders from the contenders – not that we're complaining.

So to help you decide which app is best for you, we're offering a brief overview, with ratings (on a 1-to-5-birdie scale, of course), of eight Twitter apps for iPhone...
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