This article investigates youth judgments of the accuracy of truth claims tied to controversial public issues. In an experiment embedded within a nationally representative survey of youth ages 15 to 27 (N = 2,101), youth were asked to judge the accuracy of one of several simulated online posts. Consistent with research on motivated reasoning, youth assessments depended on (a) the alignment of the claim with one's prior policy position and to a lesser extent on (b) whether the post included an inaccurate statement. To consider ways educators might improve judgments of accuracy, we also investigated the influence of political knowledge and exposure to media literacy education. We found that political knowledge did not improve judgments of accuracy but that media literacy education did.