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In this study, the authors aim to probe the relationship between listening and lurking and discuss types of lurking that occur on social media sites based on the motivations driving them. Although listening is a significant practice of online attention, intimacy, connection, obligation and participation as much as voice is, it is yet to receive the kind of attention voice is given in the context of social media. In the rather limited studies on online attention, the concept that has gained consideration is “lurking”, and this practice has often been treated as a derogatory non-activity or as passivity. The interest to study lurking is based on the premise that lurking is a significant ground on which listening occurs in social media and through which voice can be given attention.

This study adopted a phenomenological approach to understand motivations for lurking in online spaces. Phenomenological research involves data gathering through inductive, qualitative methods with the aim of explaining specific phenomena from the perspective of research participants. In this research, the lived experience studied was lurking and what drives lurking. A total of 12 members of the Licence to Talk project, a research project based at the School of Journalism and Media Studies, Rhodes University, South Africa, took part in the study. They shared their personal experiences of online lurking through a critical reflective writing. Based on the experiences shared, the authors identified and categorised the various types of lurking based on the varied motivations driving them.

Through the phenomenological approach, the study has theorised a more useful understanding of lurking as a form of online listening by identifying and categorising seven lurking behaviours that are nested within the lurking activity. This study, thus, provides a tentative framework for studying online lurking by bringing to bear listening theory and by reasoning that lurking is a needs-based activity that has purpose imbedded within it.

The authors recognise that this study is limited by its small number of participants. Nevertheless, as researchers with a strong grounding in listening theory, the authors thought it valuable to interrogate their own practices on social media and to develop a more useful understanding of what lurking might entail and, on the lurking-listening relationship. A larger study would provide stronger evidence to test the hypothesis about lurking as a very interesting form of listening with a relationship to complex behaviours and needs.

It is expected that by conceptualising the various forms of lurking based on the motivations that drive online lurking (listening), it will provide an empirical and theoretical/conceptual basis for further investigations into this pervasive mode of online attention.

This paper aims to describe the influence of maleinized linseed oil (MLO), when used as a lubricant, on the thermal and rheological properties of PLA/MWCNTs (polylactic acid/multi-walled carbon nanotubes) and PLA/HNT (halloysite nanotubes) nanocomposites, as a reference for application in 3D printing processes.

Nanocomposites were obtained by melting in a twin-screw extruder, mixing PLA with MWCNTs and HNTs in different percentages of 0.5, 0.75 and 1 Wt.% for subsequent mixing by the same process with 5 phr MLO, for application in additive manufacturing, as analyzed by means of differential scanning calorimetry (DSC), capillary rheometry, melt flow rate (MFL) and field emission scanning electron microscopy (FESEM).

The results obtained for thermal characterization by using DSC indicate the non-variation of glass transition temperature Tg = 62 ± 2°C and a melting temperature (Tm) around 170°C. Crystallization temperature dropped by approximately 12°C, which should be kept in mind during the transformation processes. The values obtained by capillary rheometry indicate that the material’s viscosity is reduced by the influence of the MLO plasticizer’s lubricant effect on the PLA’s molecular structure. The melt flow index values confirm a rise of approximately 46% in the flow index and back up the capillary rheometry results. The values obtained were as follows: PLA/0.5 Wt.% MWCNT/MLO 5 phr 54.07, PLA/0.75 Wt.% MWCNT/MLO 5 phr 53.46, PLA/1 Wt.% MWCNT/MLO 5 phr 51.84y PLA/0.5 Wt.% HNT/MLO 5 phr 61.8, PLA/0.75 Wt.% HNT/MLO 5 phr 68.3 and PLA/1 Wt.% HNT/MLO 5 phr 71.2 g/10 min. Apart from the nanocharge distribution, the information obtained from the FESEM shows the existence of a cluster, which could have been avoided by more energetic stirring during the nanocompound manufacturing process.

This paper presents an analysis of the insertion of plasticizer in nanocomposites for the application in additive manufacturing processes in fusion deposition modelling (FDM) system.

This is a novel original research work.

The purpose of this study is to gain insight into the dynamics and considerations of professionals regarding the sharing of tacit, personal knowledge in their practice.

Adopting a social-constructivist ontology, the qualitative design deploys semi-structured interviews and focus groups. Data were coded, and analysed through interrelating and reasoning.

Personal knowledge is difficult to share precisely, but can be shared to some extent using reflection and stories. Knowledge also provides a position and professional agency, emphasising boundaries and impacting the decisions on interaction and sharing. As such, professional commitment is vulnerable and contextual and, by extension, material becomes part of this interplay of professional practice and collaborative development.

Findings imply that exchange and use of knowledge and material present in organisations are impacted by individual professionals’ autonomy and decisions, which consequently impact on employees’ practice. This calls for research that focuses on individual factors such as autonomy, professionalism and attitudes in addition to organisational and facilitative matters.

Stimulating professional commitment and interpersonal learning is a matter of valuing personal knowledge and practice to avoid protectionism, boundaries and segregated agency. Management and professionals should consider how and why individuals exchange their personal knowledge, paying attention to social structures and individuals’ voices and objectives in forming communities.

This study combines the concept of tacit knowledge with the younger field of practice theory. By connecting personal knowledge to practice, it extends agency to the material world and offers a more individual perspective to knowledge sharing in and between entities.