More than 40% of TV viewers use social media while they watch TV at least once a week

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Source:  Research by Ericsson, reported in a press release, 2nd September 2011
Full presentation here
Methodology:  "Data was collected in Australia, Austria, Brazil, China, Germany, the Netherlands, Russia, Spain, Sweden, Taiwan, the UK, the US and South Korea. In all, 22 qualitative and 13,000 quantitative interviews were conducted representing almost 400 million consumers."