Tokyu ad agency found massive usage of Keitai (cell phone) mail among Junior High and High school students.
31% of them receive more than 41mails a day
19% of them receive 11 to 20 mails
18% of them receive 6 to 10 mails
15% receive 21 to 30
10% receive 1 to 5 mails
source: yomiuri shinbum
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