Melbourne University's Dr Brent Coker says workers who surf the internet for leisure, known as 'Workplace Internet Leisure Browsing' (WILB), are more productive than those who don't. [...] "People who do surf the internet for fun at work - within a reasonable limit of less than 20 per cent of their total time in the office - are more productive by about nine per cent than those who don't," said Dr Coker, from the university's Department of Management and Marketing.