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.

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Lenna Garibian is a MarketingProfs research writer and a marketing consultant in the tech industry, where she develops engaging content that builds thought leadership and revenue opportunities for clients. She's held marketing and research positions at eRPortal Software, GAP Inc., Stanford University, and the IMF. Reach Lenna via Twitter @LennaAnahid and LinkedIn.