This study explores the relationship between using social networks sites (SNS), marriage satisfaction and divorce rates using survey data of married individuals and state-level data from the United States. Results show that using SNS is negatively correlated with marriage quality and happiness, and positively correlated with experiencing a troubled relationship and thinking about divorce. These correlations hold after a variety of economic, demographic, and psychological variables related to marriage well-being are taken into account. Further, the findings of this individual-level analysis are consistent with a state-level analysis of the most popular SNS to date: across the U.S., the diffusion of Facebook between 2008 and 2010 is positively correlated with increasing divorce rates during the same time period after controlling for all time-invariant factors of each state (fixed effects), and continues to hold when time-varying economic and socio-demographic factors that might affect divorce rates are also controlled. Possible explanations for these associations are discussed, particularly in the context of pro- and anti-social perspectives towards SNS and Facebook in particular. (C) 2014 Elsevier Ltd. All rights reserved.