during December 2011. We experienced growth in DAUs across major markets including Brazil, India
and Japan. Overall growth in DAUs was driven largely by increased mobile usage of Facebook.
Relative to September 30, 2012, DAUs increased from 584 million to 618 million, due to an increase in
mobile users. During the fourth quarter of 2012, the number of DAUs using personal computers
declined modestly compared to the third quarter of 2012, including declines in key markets such as the
United States, while mobile DAUs continued to increase.
mobile-optimized versions of our website such as m.facebook.com, whether on a mobile phone or
tablet such as the iPad, during the period of measurement.
of December 31, 2011. In all regions, an increasing number of our MAUs are accessing Facebook
through mobile devices, with users in the United States, India and Brazil representing key sources of
mobile growth over the fourth quarter of 2012 as compared to the third quarter of 2012. Approximately
157 million mobile MAUs accessed Facebook solely through mobile apps or our mobile website during
the month ended December 31, 2012, increasing 25% from 126 million during the month ended
September 30, 2012. The remaining 523 million mobile MAUs accessed Facebook from both personal
computers and mobile devices during that month. While most of our mobile users also access Facebook
through personal computers, we anticipate that the rate of growth in mobile usage will exceed the
growth in usage through personal computers for the foreseeable future and that the usage through
personal computers may be flat or continue to decline in certain markets, including key developed
markets such as the United States, in part due to our focus on developing mobile products to encourage
mobile usage of Facebook.
geography during a given quarter, divided by the average of the number of MAUs in the geography at the
beginning and end of the quarter. Annual ARPU is the sum of respective quarterly ARPU amounts in that year.
Our revenue and ARPU in markets such as United States & Canada and Europe are relatively higher due to the
size and maturity of those advertising markets as well as our greater sales presence and the number of payment
methods that we make available to marketers and users.