Shoko Someya is a member of Japan's "thumb tribe". The 28-year-old real estate agent from Saitama, north of Tokyo, does not own a PC and does not need to. Like millions of other young Japanese she appears to be permanently using her "keitai" - mobile phone - to send and receive emails, download music, access mixi (Japan's immensely popular version of MySpace.com), look at web pages, perform Google searches, check train timetables, and more.

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