In the week after the Verizon iPhone launched on February 10, we got a pop in new usage with Facebook for iPhone adding nearly 1.1 million new monthly active users, its highest week-over-week gain in three weeks. The spike in additional monthly actives pales in comparison to what Christmas produced, but that’s because Facebook usage normally peaks around the holidays when users are far from friends. Just to be perfectly clear, the charts below shows the rate of growth, not the overall size of Facebook for iPhone or Android usage.
The Verizon iPhone launch certainly didn’t slow Android down. The platform’s growth is accelerating, with 1 million additional monthly active users compared to a just over 892,000 added the week before. (We have been tracking Facebook for Android’s growth for a shorter period of time, but will continue tracking closely this year.)
All in all, while Facebook for iPhone did add more than 1 million users this week, its growth is decelerating, suggesting that the Verizon launch will probably not sustain Apple’s marketshare. It has been less than two weeks, so it’s difficult to draw a definitive conclusion. We’ll be continuing to watch both mobile clients.