Capitalizing on Web 2.0 to improve communication and knowledge sharing among stakeholders, a new form of business processes (BP), called social business processes (SBP), has emerged. This chapter provides a social business process meta-model called SBP2M that enriches an existing business process meta-model with social aspect. It also proposes a domain-specific language (DSL) for SBP modeling. This DSL is defined based on SBP2M and developed as an extension of the standard BPMN notation. The proposed DSL is simple and yet generic thanks to the reduced number of extensions and its ability to model SBP regardless of the used Web 2.0 technology. To show the applicability of the proposed notation, the authors have implemented it within the BPMN2 modeler editor.