Americans are so fixated on social networks that they spend an average of 16 minutes out of every hour on them, according to a study by Experian Marketing Services. In the U.S., 27% of users’ time online is spent on forums and social networks, like Facebook, Twitter and Instagram, Experian said. Experian included both desktop and mobile users in its study. It found that the U.S. is a bit more hooked on social networks than Internet users in the United Kingdom, who spend 13 minutes of each hour on social nets, and Australians, who spend 14 minutes per hour. U.S. social networking numbers have held fairly steady over the last few years. Experian reported that social media took up 30% of Americans’ time in 2011 and 27% last year. Dan Olds, an analyst with The Gabriel Consulting Group, said he’s not surprised that people are spending so much time on Facebook, Google+ and Tumblr.