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This study explores the relationships between discussion networks and the development of extreme attitudes toward stem cell research during the 2004 presidential election. The authors test competing theoretical models that address discrepancies in previous attitude polarization research--whether interpersonal discussion leads to attitude extremity or extremity leads to discussion, within the deliberating American public. Using data from a nationwide mail panel survey carried out between 2002 and 2005, the authors explore within-wave and between-wave causal paths, revealing patterns difficult to discern in cross-sectional survey or lab experimental designs. Our findings show that political talk plays a substantial role in shaping and polarizing attitudes on stem cell research, with discussion in networks composed of like-minded others leading directly to the development of extreme attitudes. Keywords: attitude extremity; discussion networks; polarization; political talk

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This study investigates how nonprofit organizations use hyperlinks embedded in tweets for strategic communication during global health crises. Within the 1,494 links included in tweets about Ebola, organizations shared owned and earned media, including news stories directly or indirectly referencing their work and positive mentions from others on social media. Links allowed organizations to raise awareness about Ebola in West Africa, promote their work, and highlight endorsements from news media and influential users. Raising awareness and building trust are key steps in becoming credible sources during highly uncertain crises. [ABSTRACT FROM AUTHOR]

Water is essential for human life, yet safe drinking water is a limited resource. Critical to fighting the global water crisis are public awareness campaigns, including Public Service Announcements (PSAs). While YouTube has become a popular medium for disseminating prosocial content such as PSAs, environmental communication efforts on this platform remain largely uninvestigated. This study examines the content and characteristics of global water crisis PSAs on YouTube by applying two communication models: the Extended Parallel Process Model, and the Elaboration Likelihood Model. These models are used to evaluate the potential effectiveness of the PSAs. Content analysis reveals that threat messages often outweigh efficacy messages in the videos, central route processing cues are more prevalent than peripheral route cues, and a focus on quality or quantity issues differed by sponsoring organization (non-profit, for-profit, government). Implications and avenues for potential future research are discussed. [ABSTRACT FROM AUTHOR]

Although Twitter chats and other forms of social media engagement events are idealized in the literature as opportunities for dialogic communication between organizations and individuals, less is known about how engagement is operationalized within these spaces. Using textual and content analysis, we conducted two studies to explore how health organizations engage with the public via Twitter chats during the Ebola and Zika outbreaks. In official records of Ebola chats, the organization addressed both hostile and neutral public questions that pressed for specification of disease characteristics and protocol. However, in a content analysis of all public tweets sent during a later Zika chat, we found that questions were privileged, and other tweet forms and themes were excluded from the participatory space. Specifically, public comments demonstrating expertise or extending the topic of the chat were not addressed by the organization. Our analysis provides insight into the implicit rules governing how organizations engage with the public online during a rapidly evolving health crisis. We argue that the question–response dyad is a form of ideal communication that suggests engagement but maintains organizational expertise. [ABSTRACT FROM PUBLISHER]

The methods by which politicians and policy makers communicate with the public are constantly adapting to the ever-changing media environment. As part of this changing landscape, this study considers the case of Twitter. Specifically, the authors conduct a survey of political Twitter users, in order to understand their use of the medium and their political behaviors within it. Results indicate that political Twitter users are more interested in and engaged in politics in general and less trusting of the mainstream media. Moreover, the study investigates the extent to which followers of a campaign may affect its overall influence in the Twitterverse. [ABSTRACT FROM PUBLISHER]

This study compares two frequently used operationalizations of understanding: factual knowledge and perceived familiarity. The authors argue that these measurements--which have been used interchangeably in past research--are conceptually distinct and should be treated as such. Using hierarchical linear ordinary least squares regression, this study provides evidence that factual knowledge and perceived familiarity are only slightly correlated and are influenced differently by predicting variables, such as media use and cognitive processing variables. As a result, the use of these measures may result in different assessments of the levels of public understanding, which has important implications for future policy decisions. [ABSTRACT FROM AUTHOR]

How do citizens make sense of nanotechnology as more applications reach the market and the mainstream media start to debate the potential risks and benefits of technology? As with many other political and scientific issues, citizens rely on cognitive shortcuts or heuristics to make sense of issues for which they have low levels of knowledge. These heuristics can include predispositional factors, such as ideological beliefs or value systems, and also short-term frames of reference provided by the media or other sources of information. Recent research suggests that ‘religious filters’ are an important heuristic for scientific issues in general, and nanotechnology in particular. A religious filter is more than a simple correlation between religiosity and attitudes toward science: it refers to a link between benefit perceptions and attitudes that varies depending on respondents' levels of religiosity. In surveys, seeing the benefits of nanotechnology is consistently linked to more positive attitudes about nanotechnology among less religious respondents, with this effect being significantly weaker for more religious respondents. For this study, we have combined public opinion surveys in the United States with Eurobarometer surveys about public attitudes toward nanotechnology in Europe to compare the influence of religious beliefs on attitudes towards nanotechnology in the United States and Europe. Our results show that respondents in the United States were significantly less likely to agree that nanotechnology is morally acceptable than respondents in many European countries. These moral views correlated directly with aggregate levels of religiosity in each country, even after controlling for national research productivity and measures of science performance for high-school students. [ABSTRACT FROM AUTHOR]

Recent research has suggested that traditional and online news sources may differ with respect to their ability to inform audiences. In particular, there is tentative evidence that the hyperlink structure of online newspapers, for example, can promote a more in-depth understanding of political issues than traditional news media. The authors analyze data from the 2004 American National Election Studies (ANES) to test some of these relationships empirically. Specifically, the influence of traditional and Internet news sources on both differentiated and integrated political knowledge structures among citizens are examined. The findings reveal that users of online newspapers have higher levels of both integrated and differentiated knowledge, even after controlling for print newspaper and television use. Print newspaper use is only related to factual political knowledge, and television news use is unrelated to any of the measures of knowledge about the presidential campaign. [ABSTRACT FROM PUBLISHER]