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This study draws inspiration from the literature on Twitter adoption and activity in U.S. legislatures, applying predictions from those limited studies to all 7,378 politicians serving across 50 American state legislatures in the fall of 2015. Tests of bivariate association carried out for individual states lead to widely varying results, indicating an underlying diversity of legislative environments. However, a pooled multivariate analysis for all 50 states indicates that constituents per legislator, the youth and educational attainment of a district, legislative professionalism, being a woman, sitting in the upper chamber, leadership, and legislative inexperience are significantly and positively associated with Twitter adoption and current Twitter use. Controlling for these factors, neither legislator party, nor majority status, nor partisan instability, nor district income is significantly related to either Twitter adoption or current Twitter use. Although women are more likely than men to adopt and use Twitter, the most active users narrowly tend to be men. Finally, most variation in social media adoption and activity by legislators remains unexplained, leaving considerable room for further theoretical development.

Although the literature on social networks has made a considerable contribution to the sociological imagination in recent years, it has been largely ignored in conventional course materials. Such an omission is curious, considering social networks' intuitive imagery, broad theoretical relevance and extensive empirical application. This article offers a remedy to that oversight, describing a challenging yet accessible curriculum including readings, classroom exercises, and student-centered learning projects.

▪ Abstract  From the complex literatures on "institutionalisms" in political science and sociology, various components of institutional change are identified: mutability, contradiction, multiplicity, containment and diffusion, learning and innovation, and mediation. This exercise results in a number of clear prescriptions for the analysis of politics and institutional change: disaggregate institutions into schemas and resources; decompose institutional durability into processes of reproduction, disruption, and response to disruption; and, above all, appreciate the multiplicity and heterogeneity of the institutions that make up the social world. Recent empirical work on identities, interests, alternatives, and political innovation illustrates how political scientists and sociologists have begun to document the consequences of institutional contradiction and multiplicity and to trace the workings of institutional containment, diffusion, and mediation.

Similarity breeds connection. This principle—the homophily principle—structures network ties of every type, including marriage, friendship, work, advice, support, information transfer, exchange, comembership, and other types of relationship. The result is that people's personal networks are homogeneous with regard to many sociodemographic, behavioral, and intrapersonal characteristics. Homophily limits people's social worlds in a way that has powerful implications for the information they receive, the attitudes they form, and the interactions they experience. Homophily in race and ethnicity creates the strongest divides in our personal environments, with age, religion, education, occupation, and gender following in roughly that order. Geographic propinquity, families, organizations, and isomorphic positions in social systems all create contexts in which homophilous relations form. Ties between nonsimilar individuals also dissolve at a higher rate, which sets the stage for the formation of niches (localized positions) within social space. We argue for more research on: (a) the basic ecological processes that link organizations, associations, cultural communities, social movements, and many other social forms; (b) the impact of multiplex ties on the patterns of homophily; and (c) the dynamics of network change over time through which networks and other social entities co-evolve.

Despite progress in recent decades, the conservation management of insects and allied invertebrates in Australia is challenging and remains a formidable task against a background of poor taxonomic and biological knowledge, limited resources (funds and scientific expertise) and a relatively low level of community engagement, education and awareness. In this review, we propose a new, strategic national approach for the conservation of insects and allied invertebrates in Australia to complement and build on existing actions and increase awareness with the general public and government. A review of all species listed under relevant State and Territory Acts, national legislation (EPBC Act) and on international lists (IUCN Red List) indicated that of the 285 species currently listed under these conservation schedules, 10 (3%) are considered extinct, 204 (72%) threatened (Critically Endangered, Endangered or Vulnerable) and 71 (25%) are classified as other (Threatened, Near Threatened, Rare or Least Concern). Comparison of the geographic ranges of listed species in relation to bioregions (IBRA regions) shows a striking discordance in spatial representation across the Australian landscape, reflecting an ad hoc approach to threatened species conservation and the concentration of invertebrate biologists in urban centres of temperate coastal Australia. There is a positive relationship between the number of threatened species and extent of protection according to the National Reserve System within each IBRA region, exemplifying the anomaly in spatial representativeness of listed species. To overcome these shortfalls, we propose a novel educational, regional approach based on selecting, for each of the 89 IBRA regions, a relatively small set of 'flagship taxa' (threatened species and/or 'iconic' species of high scientific/social value), which are then promoted and/or nominated for listing by the scientific community. Such species could be adopted by local community groups whereby a community‐based regional approach would ensure spatial representativeness of insect conservation across the entire Australian continent. This novel approach may ultimately provide a better strategy for the conservation management of habitats and threatened ecological communities, reducing extinction risk of threatened species and addressing key threatening processes. Members of the Australian entomological community are strongly encouraged to nominate candidate taxa as flagship species for wider promotion and/or listing nationally under the EPBC Act. ; The authors, as members of the Australian Entomological Society Conservation Committee, gratefully acknowledge the Australian Entomological Society for financial support towards the preparation of this paper.