Americans now dedicate much of their online computer time visiting social networking sites and blogs and less time checking their e-mail, according to Nielsen.
"Despite the almost unlimited nature of what you can do on the web, 40% of U.S. online time is spent on just three activities -- social networking, playing games, and e-mailing, leaving a whole lot of other sectors fighting for a declining share of the online pie," said Nielsen analyst Dave Martin, in a statement.
