Despite Facebook's dominance among social networking sites, there's considerable fluidity among the Facebook user population, according to a new report by the Pew Research Center.

Two-thirds (67%) of online American adults use Facebook, making it the top social network in the US; but, among those users, 61% say they have at some point voluntarily taken a break from using Facebook for several weeks or more.

Moreover, 20% of online adults who don't use Facebook say they once used the site, but no longer do so.

Below, additional findings from the report titled "Coming and Going on Facebook," issued by the Pew Research Center's Internet and American Life Project, February 5, 2013.

Taking a 'Facebook Vacation'

Among Facebook users who've taken a break from using the site, a plurality (21%) cite their busy lives as a reason for having done so. Others point toward a general lack of interest in the site itself (10% mentioned this in one way or another), an absence of compelling content (10%), excessive gossip or "drama" from their friends (9%), or concerns that they were spending too much time on the site (8%):

Value of Facebook to Users

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