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according to research by Nielsen Co. The time spent on social media accessed from PCs rose from 15.8% in June 2009 to 22.7% in June 2010, according to Nielsen, while online gaming gained more modestly to 10.2% of online time from 9.3% a year earlier. But that was enough to push gaming past e-mail, which fell to 8.3% of online time spent at the PC from 10.5% a year earlier.

separating social-media time from gaming time has become tougher, given that a growing portion of online gaming takes place via Facebook applications such as Zynga's Farmville, Nielsen analyst Dave Martin acknowledged.

. The shift of e-mail use from PCs to mobile devices accounts for some of the decline of time spent on e-mail at PCs

a small proportion of internet users were classed as internet addicts and that people in this group were more likely to be depressed than non-addicted users.

The mean age of the 18 internet addicts, 13 of whom were male and five female, was 18.3 years.