In the 1,001 days from April 1, 2009 through December 28, 2011, Facebook added 609 million users, for averages of around 600,000 per day and seven per second.
But that growth rate has been tapering off, according to data from Optim.al (mind you, we noted a slowdown a year ago).
The Facebook ad-testing and ad-management system also found that:
- The social network’s growth pace has slowed, from seven per second from April through November 2009, to 6.96 from November 2009 through July 2010.
- Growth had soared to 8.39 per second from July 2010 through March 2011, then slowed to 7.02 from March 2011 through September 2011, and to five from September 2011 through December 2001.
- Facebook added more than 97 million users in the U.S. during the 1,001-day period, but in the past 90 days, just four percent of new users have come from the country.
- The U.S. accounts for 19.7 percent of the total Facebook user base.
- Brazil saw huge growth, added 34.8 million users during the period, or 1,447 per hour, with the past 90 days seeing growth of 3,343 per hour, or .93 per second. The country accounted for 19 percent of new users over the past three months, despite making up only 4.4 percent of the social network’s user base.
- Growth is also soaring in India, with nearly five million new accounts over the past 90 days, or 2,304 per hour and 0.64 per second.
- India accounted for 13 percent of new Facebook users during the past three months, while representing just 3.4 percent of the overall user count.
One reason for the growth slowdown may simply be saturation: Most Internet users who are likely to be Facebook users already have accounts, so growth is restricted to new Internet users and a few hold-outs.
Readers: Why do you think the growth rate of Facebook’s user base is decreasing?