This paper proposes requirements patterns for Online Social Networks (OSNs). Patterns are based on features observed on currently popular OSNs, and are defined as i-star models. Patterns are relevant for the requirements engineering of new OSNs. They can help in requirements elicitation, in order to avoid missing important OSN requirements. They can be used as basic models of OSN requirements, something that a modeler starts from, and then specializes and changes according to the specific requirements from OSN stakeholders.
Keywords: Requirements Engineering, Online Social Networks, Requirements Patterns