3 Citations (SciVal)


The purpose of this pre-registered study was to investigate how different ideological groups justified and mobilised collective action online. We collected 6878 posts from the social media accounts of pro-Black Lives Matter (n = 13) and anti-Black Lives Matter (n = 9) groups who promoted collective action in the month after George Floyd's murder and the Black Lives Matter (BLM) protests and counter-protests. We used content analysis and natural language processing (NLP) to analyse the content and psychological function of the posts. We found that both groups perceived their action as ‘system-challenging’, with pro-BLM accounts focused more on outgroup actions to mobilise collective action, and anti-BLM accounts focused more on ingroup identity. The reverse pattern occurred when the accounts were attempting to justify action. The implications are that groups’ ideology and socio-structural position should be accounted for when understanding differences in how and why groups mobilise through online interactions.

Original languageEnglish
Pages (from-to)1082-1110
Number of pages29
JournalEuropean Journal of Social Psychology
Issue number7
Early online date2 Nov 2022
Publication statusPublished - 31 Dec 2022

Bibliographical note

Funding Information:
This work was funded by the Centre for Research and Evidence on Security Threats (Award ES/V002775/1), which is funded in part by the United Kingdom security and intelligence services.


  • collective action
  • conservative
  • ideology
  • progressive
  • social media

ASJC Scopus subject areas

  • Social Psychology


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