During the last decennia media environments and political communication systems have changed fundamentally. These changes have major ramifications for the political information environments and the extent to which they aid people in becoming informed citizens. Against this background, the purpose of this article is to review research on key changes and trends in political information environments and assess their democratic implications. We will focus on advanced postindustrial democracies and six concerns that are all closely linked to the dissemination and acquisition of political knowledge: (1) declining supply of political information, (2) declining quality of news, (3) increasing media concentration and declining diversity of news, (4) increasing fragmentation and polarization, (5) increasing relativism and (6) increasing inequality in political knowledge.

The dimensions that individuals apply in evaluating the trustworthiness or credibility of news media bear great theoretical and practical relevance. In previous research, however, there is no standardized scale for the measurement of trust in news media. Thus, the purpose of this article is to present the development and validation of a multidimensional scale of trust in news media. A theoretically derived model is tested on a representative sample via confirmatory factor analysis. After some modifications, the model is then validated on another independent sample. These results confirm the hypothesis that trust in news media can be considered a hierarchical factor (of second order) that consists of four lower order factors, including trust in the selectivity of topics, trust in the selectivity of facts, trust in the accuracy of depictions, and trust in journalistic assessment. This model is the first validated scale of trust in news media in communication research.

Celebrities frequently endorse products, brands, political candidates, or health campaigns. We investigated the effectiveness of such endorsements by meta-analyzing 46 studies published until April 2016 involving 10,357 participants. Applying multilevel meta-analysis, we analyzed celebrity endorsements in the context of for-profit and non-profit marketing. Findings revealed strong positive and negative effects when theoretically relevant moderators were included in the analysis. The most positive attitudinal effect appeared for male actors who match well with an implicitly endorsed object (d = .90). The most negative effect was found for female models not matching well with an explicitly endorsed object (d = −.96). Furthermore, celebrity endorsements performed worse compared to endorsements of quality seals, awards, or endorser brands. No publication bias was detected. The study has theoretical and practical implications, and provides an agenda for future research.

Drawing from the affect–reason–involvement model, we examine how misleading advertising about the environmental features of products, or greenwashing, affects how consumers perceive ads and brands. Using data from two experimental studies with quota-based samples in the United States (N = 486) and Germany (N = 300), we compare nondeceptive claims with two types of claims often used in greenwashing: vague claims and false claims. We also identify the presence of pleasant nature-evoking images and test for interaction effects with two types of environmental involvement: environmental concern and environmental knowledge. Results indicate that while vague claims do not enhance consumers' perceived greenwashing regardless of their environmental knowledge or concern, false claims do, which consequently harms consumers' attitudes toward those ads and brands. In the United States, consumers' environmental knowledge moderates that effect, whereas all consumers in Germany could identify false claims as attempts at greenwashing. Moreover, associating greenwashing claims with nature-evoking images activates an affective persuasive mechanism that appeals to consumers' affinity for nature, which not only positively influences their evaluations of ads and brands but also influences their attitudes toward ads and brands more strongly than perceived greenwashing. In closing, we discuss the theoretical and practical implications of these findings.