© 2016 ACM. A Social Business Process (SBP) is the result of blending so-cial computing (a.k.a. Web 2.0) with business process (BP). Despite the benefits of SBP to enterprises, several limita-tions continue to undermine them. In this paper, we ad-dress two specific limitations, namely the difficulty of cap-turing SBP's requirements and the lack of a definition for SBP. Thus, meta-modeling is used to capture requirements from organizational, technological, and management per-spectives. In addition, we introduce a definition for SBP by enriching an existing BP meta-model with social con-cepts. To annotate the SBP model with its requirements, a BPMN extension is proposed. The proposed meta-models are evaluated in terms of completeness and clarity using the Bunge-Wand-Weber ontology.