Nielsen released the results of a survey of the most popular mobile applications, with Facebook taking the crown on the iPhone and Google Maps winning the honor on Android phones. Facebook also was the top app on BlackBerry, which's an interesting result given that those devices have historically been used in the corporate environment. Overall, games are the most popular applications on smarthphones, followed by music, social networking and news/weather apps.
"Facebook, Google Maps and Weather Channel are the most popular apps across smartphones:
iPhones: Facebook (58%), iTunes (48%), Google Maps (47%)
Android: Google Maps (67%), Facebook (50%), Weather Channel (38%)
Blackberry: Facebook (51%), Google Maps(34%), Weather Channel (28%)"