There are more than 30 million active users currently accessing Facebook through their mobile devices. (source) People that use Facebook on their mobile devices are almost 50% more active on Facebook than non-mobile users. (source)
via lukew.com
I know I saw the 30mm number floating arond the other day, but I was more impressed by the following tidbit. because it's _harder_ to use the web on a mobile device. those facebookers must be seriously motivated.
oh, and mostly from other places.