The truthiness effect (Newman et al., 2012) refers to the tendency to believe statements to be true when they are presented together with a photo that is non-diagnostic for veracity. In an online experiment (N = 96) with two measurement time points, this effect and its persistence over time were investigated and extended by adding feedback on the veracity. The participants rated the veracity of trivia statements, which were presented either together with a non-diagnostic photo or without a photo. This was followed by either feedback on the actual veracity with a photo, without a photo or no feedback. After about 48 hours, the subjective truth of the statements was assessed again. The truthiness effect could neither be replicated immediately after the presentation of the statements nor after about 48 hours. Overall, feedback on the veracity led to the subjects being able to discriminate correctly between true and false statements more often at the second time point. Feedback with photos was particularly effective. Unexpectedly, each type of feedback also led to a response bias towards true. Based on the present results, the usage of a photo when giving feedback can be recommended. However, the importance and practical relevance of the truthiness effect require further research.