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??????1945??-1950?????????????1960????? ?????80%?? ????????1990?????????2010???????????? 80%?? ???????????2004?????????????2010????? ????60%??

???????2011???????????3G???????????? 9.36????????????????17%?????????35%??

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2008??-2011??Pandora????????豸??????????仯???2008???5%??2011???60%??

2008??-2011??Twitter????????豸??????????仯???2009???25%??2011???55%??

2008??-2011??Facebook????????豸??????????仯???2008???0%??2011???33%??

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