The mental world under discussion covers the characteristics of the makeup of net surfers and their mental states.

而在心理世界中，网民的构成和心理特征是广告商必须考虑的重要因素。

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On August 28th, Somalia became the latest African country to offer local access to the Internet, and for the first time surfers can use the net in Swahili.

ECONOMIST: Tapping into Africa

But an optimist would point out that as the number of surfers doubled during the past three years, growth in Net use among less-affluent demographic segments has kept up with that of the upper crust.

CNN: Web surfers aren't just young techie males anymore

Older surfers are the most rapidly growing segment of net users, with their numbers swelling by more than 40% in the past year.

BBC: Janet Thorpe