eMarketer is estimating that 132.5 million people in the US will use Facebook this year, up from 116.8 million people last year. By ;2013, that number is expected to increase to 152.1 million.
From the eMarketer graph above, it is quite apparent that Facebook’s growth in the U.S. is flattening out and most people who are going to use Facebook are already signed up.
The growth that Facebook is seeing is primarily amongst older boomers and seniors. At the same time, teens and young adults will continue to form the core of Facebook’s audience, with penetration rates among these groups ranging from 80% to 89% of internet users by 2013.