The iTunes store does not really give a clue about the popularity of twitter apps. However,a list made from AppsFire, an apps sharing service shows the following as the top ten twitter clients on the iPhone:

1. Tweetdeck (Free)
2. Tweetie
3. Twitterific (Free)
4. Twitterfon (Free)
5. TwitterFon
6. IM+
7. Twitterific Premium
8. iTwitter
9. ShoZu
10. Boxcar

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