Purpose: Buying behaviour can be interpreted as a signal of social identity. For example, individuals may purchase specific cars to indicate their social status and income, or they may dress in particular ways to show their taste in fashion or their membership in a social group. This paper aims to focus on the identification of market place influencers in a social identity context, in order to better market products and services to social groups. Design/methodology/approach: A structural model linking consumers' individual capital (motivation to influence), social capital (opportunistic use of social influence), and social leadership ability (persuasive "power") is introduced. Hypotheses on the interrelations of these factors are proposed and the model is empirically tested using causal analysis. The survey data were collected in Germany in the context of socially influenced automotive buying behavior (428 valid questionnaires). Findings: The proposed model supports significant relations between individual capital and social capital and social leadership ability. The results suggest which factors (individual and social capital) describe social influencers, helping to identify powerful social influencers in a social identity context. Different types of social influence leaders and followers are presented and characterized. Originality/value: This paper offers marketing researchers and practitioners a new integrative approach to target consumers with specific social identities via social influencers. © Emerald Group Publishing Limited.