Given the immense shifts the social networking sites and applications have brought about, a considerable number of researchers in the field of communication studies have turned to study different aspects of social media usage and factors influencing it. This study gathered data from 33318 US non-institutionalized citizens over 18 including 17079 females and 16239 males; they were members of web panelists of Pew, and their answers revealed that a majority of this online participants used a kind of social media. The results of this study revealed women use social media more than men, and religious people more than non-religious people. In addition, the results indicated that married people are the least users of social media in comparison with other marital groups. Our results showed that all demographics are significantly related to social media usage. But this significance can be somehow misleading because of weak practical effect sizes. Except for marital status and age Cramer’s V values are too small and their significance may have nothing to say but sensitivity to the degree of freedom.