Smartphone users in the U.K. spend the most time accessing social networks on their devices, and, by extension, they also spend the most time on Facebook, according to a study of January 2013 usage by Arbitron Mobile Oy.

The Arbitron study found that 86 percent of smartphone users in the U.K. accessed social networks via their devices in January, accounting for an average of 656.4 minutes during the month.

Indonesia was tops in terms of percentage of users accessing social networks via smartphones, at 88.6 percent.

Narrowing it down to Facebook, 79 percent of U.K. smartphone users accessed the social network during January, spending an average of 560.5 minutes on it.