People who access Facebook on mobile devices are nearly 50% more active than non mobile users

"There are more than 65 million active users currently accessing Facebook through their mobile devices.
People that use Facebook on their mobile devices are almost 50% more active on Facebook than non-mobile users.
There are more than 180 mobile operators in 60 countries working to deploy and promote Facebook mobile products"
[Growth: In December 2008 15m people accessed Facebook through mobile devices, in January 2009 >21m people accessed through mobile, and in April >30m people accessed through mobile devices]
Source: Facebook official stats, retrieved 10th September 2009