A study from the University of Melbourne found that employees who took short breaks to surf the internet or engage in social media like Facebook and YouTube were 9% more productive than those who did not. The study showed that brief, unobtrusive breaks allow the mind to rest and improve concentration over the full work day. However, the increased productivity was only seen in those who used the internet moderately and for less than 20% of their work time. Excessive or addictive internet use was found to decrease productivity.