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Facebook is the most popular mobile app in the U.S. in terms of unique users — at least for now.
The signature Facebook app passed Google Maps in October of last year to become the most used mobile app in the U.S. and held onto the top spot through the end of the year, according to data released Wednesday by comScore Mobile Metrix.
Facebook's app enjoyed strong growth in 2012 with 85.5 million monthly unique users in the U.S. in December across iOS, Android and RIM's mobile platforms, up from just under 65 million in March, when comScore first started tracking mobile app data. (In October, Facebook reported 604 million monthly mobile users worldwide.) Google Maps, on the other hand, saw its active user numbers dip from about 80 million in August and September to a little more than 70 million in October after it was removed as a default app on iOS 6.