This study investigates the effects of restricting user engagement on fairness perceptions within social media platforms. Using experimental methods, we find that limiting user participation, particularly in providing negative feedback, significantly reduces perceptions of procedural and overall fairness. Notably, users who highly value self-expression are especially sensitive to these restrictions, showing heightened concern when their ability to contribute is curtailed. Our research establishes a direct link between changes in engagement policies and user perceptions of fairness and trust, suggesting that prioritizing content creators over users may undermine trust and future usage intentions. Furthermore, procedural fairness is affected by the opportunity to provide feedback, irrespective of its influence on outcomes. These insights underscore the importance of tailoring engagement policies to the platform's primary function, whether for socializing, entertainment, or information sharing.
