This chapter introduces the concept of confirmation bias, highlighting its critical importance in online information processing. It explores how individuals unconsciously seek out and reinforce information that aligns with their preexisting beliefs, particularly in the digital age. The chapter also examines the feedback loops that contribute to the persistence or moderation of these biases, setting the stage for the research questions and hypotheses that drive the study. Key concepts like the cognitive mechanisms behind news consumption and the social implications of online polarization are covered, framing the study’s focus on active content creation and temporal dynamics.