The US's 43% social-media surge in the past year led "a substantial shift in how the country spends its online time," Advertising Age reports, citing Nielsen research. From June 2009 to this past June, "the time spent on social media accessed from PCs rose from 15.8% ... to 22.7%," with social networking topping the list of American's favorite online activity and gaming passing up email for the … [Read more...] about Americans’ social media use up 43%: Nielsen