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The purpose of this study is to investigate the effect of online social networking on couplechr('39')s relationships. Relationships between couples in this study measured and examined in five dimensions: sexual satisfaction, intimacy, couple conflict resolution, domestic violence, couplechr('39')s financial agreement, and couples consent in child rearing. The research method is survey and the statistical population includes married people of Tehran. The sample size is 340 couples in Tehran which is calculated by Cochran formula. The sampling method is multi-stage cluster sampling and the samples of each cluster has been selected systematical randomly. The results showed that sexual satisfaction has the highest mean among the variables of couplechr('39')s relationships. Regression analysis shows that online social networks have the greatest impact respectively on reduce of violence between couples, agreement on child rearing, intimacy between couples, conflict between couples, financial relationships between couples and satisfaction of coupleschr('39') sexual relationship. According to the results of this study, mere use and membership of online social networking does not have a positive or negative effect on couplechr('39')s relationship, but rather the quality of using online social networking that determines its positive or negative impacts and consequences.