At least now we know why Facebook was running that internal 'Droidfood' campaign:
http://ben-evans.com/benedictevans/2013/1/2/facebooks-545m-mobile-app-users
Android Facebook app use has surged past iDevice Facebook app use. I guess it makes sense that they finally made the Facebook for Android app use native code and not be utterly awful. Android is now their largest Facebook userbase, surpassing both iDevices and the poor sods who actually still use Facebook on their phone web browsers.
Less than half of Facebook users now access it from their computers. Facebook has become primarily a mobile social networking platform in just a year. It's no wonder they've been shitting themselves trying to figure out how to monetize mobile.