This article aims to explore if social exclusion can constitute a pathway to radicalization, and if individual level of sensitivity of rejection moderates the effect of social exclusion. Humans innately seek belonging and meaning, and strive for re-establishing a sense of value and belongingness if faced with social exclusion. One way to achieve this is by adherence to a new and inviting group. In four studies, we test to what extent individuals who face social exclusion adapt to a radical including group. In Studies 1 ( n = 104) and 2 ( n = 308), we use a social media-like paradigm to manipulate social exclusion. In Study 3 ( n = 1041), we use the so-called Cyberball paradigm, and in Study 4 ( n = 40) we use a real-life manipulation. All studies show that rejected individuals who are sensitive to rejection are more prone to identify with, engage with and endorse an extreme group. The results hold over both ideological (Studies 1–3) and non-ideological (Study 4) content. Only the last study showed a main effect of social exclusion. We discuss the results in reference to the significance loss model of radicalization.

It is a human fundamental to desire to be valued, loved and respected -to be significant. Social exclusion induce significance loss which elicits a 'quest for significance' -the search for opportunities to re-gain significance. The present article establishes this relation in a laboratory experiment (N = 71, mean age = 28, SD = 10.42, 65% women, 35% men), showing that socially excluded individuals who are subsequently included by a radical group, adapt their attitudes in line with this group. We use a modified version of the well-known paradigm 'Cyberball' to elicit the quest for significance. The results show that when experiencing social exclusion, highly rejection sensitive individuals tend to adapt to the radical group's opinions. The results are important, highlighting a mechanism in the radicalization process and the importance of taking social factors into account in this process.

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Engaging in political protests are becoming increasingly common, and considering the potential, individual, costs and the low probability of affecting the political outcome, it is necessary to understand the motivations behind such actions. The desire to be part of a social group is deeply rooted in human nature, and previous research proposes that the groups one belongs to may influence the decision to engage in protests. We build on this research and suggest that social exclusion, individual fear of exclusion and need to belong interact in explaining who is likely to become engaged. In two studies, one natural experiment and one lab-experiment, we show that social exclusion increase willingness to participate in protests for individuals high in both rejection sensitivity and need to belong. We conclude that contextual factors, such as exclusion or marginalization should be considered in relation to individual level personality factors when explaining who is likely to become engaged in political protests. These results are important since they suggest that some people engage in politics simply due to social reasons and are less ideologically motivated.

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