Two-thirds of online American adults 67% are Facebook users, making Facebook the dominant social networking site in this country.   And new findings from the Pew Research Center’s Internet & American Life Project indicate there is considerable fluidity in the Facebook user population:

via Coming and Going on Facebook | Pew Internet & American Life Project.

• 3% of Facebook users say they plan to spend more time on the site in the coming year.
• 27% of Facebook users say they plan to spend less time on the site in the coming year.
• 69% of Facebook users say they plan to spend the same amount of time on the site this coming year.