cities with most twitter users

Continuing with the exploration of cities with a population actively engaged in global communications, here is a snapshot of the top 30 cities with most tweets (twitter messages) as calculated by TwitterLocal. The link presents the top 30 in the last 24 hours, here is a snapshot at the time of publishing:
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• Tokyo – 13.5%
• New York – 9.2%
• San Francisco – 6.1%
• Los Angeles – 5.9%
• London – 4.9%
• Washington – 4.1%
• Chicago – 3.9%
• Boston – 3.0%
• Seattle – 3.0%
• Sao Paulo – 2.7%

Other cities outside of North America included in the list: Osaka, Madrid, Sydney, Amsterdam, Paris, Melbourne, Berlin, Bangkok, Barcelona, Taipei, Santiago, Dublin and Caracas.