Summary: In the second quarter of the 21st century, politics has become a field not only of ideas but also of emotions, beliefs and personal realities. This transformation is shaped around the concept of ―post- truth ‖ and is radically transforming the perception of social reality. This study examines how individuals’ perceptions of information and truth are shaped, which sources of information they trust and how these perceptions relate to their political attitudes. The relationship between social media usage habits, ways of accessing information and political orientation has been analyzed using survey data in the case of Türkiye. Truth, individual perception of truth has increasingly taken on a subjective structure and that this subjective structure has become a determining factor in political preferences, polarization, and even public consent. The findings show that information trust is directly related to political polarization; individuals trust information that is consistent with their beliefs rather than reality. This situation points to the need to redefine public reason in contemporary democracies. Abstract: Of the second quarter of the 21st century , politics has increasingly become a domain not only of ideas , but of emotions , beliefs , and personal realities . This transformation is encapsulated in the concept of the ―post- truth ‖ era , which has significantly reshaped the perception of social reality. This study investigates how individuals construct their perceptions of truth and information , which sources they trust , and how these perceptions Correlate with political attitudes . The Relationship between social media usage , access to information , and political orientation is analyzed through Survey data collected in the Turkish context . The findings Reveal that in the post- truth era , individual perceptions of truth have become increasingly subjective , shaping political preferences , polarization , and even the formation of public consent . The results indicate That trust in information is directly linked to political polarization; individuals are more Likely to I believe information That aligns with their preexisting beliefs rather than objective facts . This suggests a critical need to Reconsider the role of public Reason in contemporary democracies.