However, there is always a challenge in how organizations can figure out the results of social media marketing. Therefore, this study aimed to study the effect of social media marketing on brand loyalty among smartphone users in Egypt and to identify the effect of some demographics and psychographics on this relationship. A cluster sample consisting of 502 smartphone users has been surveyed using a questionnaire that has been designed and validated. Ex-post facto design was employed to achieve the research objectives. Multi-group analysis and path analysis were employed to test research hypotheses. Results showed that social media marketing significantly affects brand loyalty, and smartphone users’ age and education significantly affect this relationship. Finally, smartphone users’ psychographics significantly affected this relationship.