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The next speaker at AoIR 2015 is Mathieu O'Neil, whose focus is on the use of social network analysis in exploring online publics. Social network analysis treats the diffusion of information online as a form of contagion. It draws distinctions between leaders and followers in the social network, and the network properties of these accounts affect how information is disseminated across the network; there are certain threshold levels for information diffusion and the emergence of information cascades.

What different categories of actors exist in social networks, then? What is the impact of social status or structural positions, and what cultural dynamics may apply? One way to approach such questions is through the concept of fields, which have their own structural features and dynamics; indeed, the recent concept of the strategic action field suggests that collective actors are attuned to and interact with each other based on their shared understandings of the field itself.

The next session at AoIR 2015 starts with Leslie Tkach-Kawasaki, whose focus is on the use of social media in the 2013 upper house election in Japan. Online campaigning has been studied for some time already, with considerable focus on the impact of technological innovation; such research has found that online practices often mirrored offline practices. Online political marketing in particular has been an extension of traditional offline marketing techniques, and the use of social media for campaign involvement has also been explored recently.

Post-war electoral reforms in Japan set up multimember electoral districts where members of the same party would vie for the same seats. The law also distinguishes between political and campaign activities, and governs the distribution of campaign materials (including geographical distribution, the means and content of messages, and the distribution channels).

The final speaker in this AoIR 2015 session is Veronika Karnowski, whose focus is on news diffusion across social media platforms. The Internet has become a main source of news, of course, and social media platforms play an increasingly important role in this. Social media are now not just a source of news content, but also act as a multiplier promoting the sharing of news; and of course they also enable follow-up communication about the news.

The various social media platforms available also enable a kind of cross-pollination between different platforms, and this needs to be researched in greater detail. How do sharing patterns on Facebook and Twitter interact with one another, for example?

The next speaker in this morning session at AoIR 2015 is Jakob Linaa Jensen, whose focus is on the social sharing of news. The landscape of news is changing, of course, and the question is whether the nature of news itself is changing. To some extent, our practices remain, and only our devices have changed – but at the same time, recent changes have also afforded us greater access to the production of news, as well as to new modes and a greater diversity in consuming news.

Perhaps the most important change is to how the news is being shared, as the borderline between production and consumption. Several studies have explored the processes of sharing the news through social media, in particular; Jakob is calling Facebook a meta-medium which incorporates multiple other media within its content, for example.

The first presenters on this second day at AoIR 2015 are Bernhard Rieder and Carolin Gerlitz, whose interest is in using data from Twitter's 'spritzer' firehose! which delivers a random 1% or all current tweets. How can this be used to identify individual types of activity in relation of the wider platform ecology? In particular, for the purposes of this paper, what light does it shed on the use of different devices for tweeting?

The project collected some 32 million tweets from the spritzer firehose over the course of one week, and key tools for tweeting were especially iPhone and Android devices. This may also be combined with the tweet contents themselves, to see which devices contribute especially strongly to specific hashtags, for example.

The final speaker in this AoIR 2015 session is my QUT colleague Wilfred Wang, whose focus is on the Chinese platform Weibo. His interest is in geography online – how do we understand local geography through our online activities?

Weibo is a Chinese microblogging platform, launched by Sina in 2009 and now featuring some 280 million accounts. Like Twitter, it works with 140-character messages, but given that these use Chinese characters they enable substantially longer texts. Weibo also incorporates more extended functionality than Twitter.

The next AoIR 2015 speaker is Fabio Giglietto, whose interest is in social television practices in Italy, around political talkshow Servizio Pubblico and reality TV contest X-Factor. What moments of these broadcasts trigger audience engagement? What similarities or differences are there in communication styles?

Fabio's project gathered relevant tweets from the shows' hashtags, and generated a number of key volumetric statistics on user activity; X-Factor audiences were considerably more active. They then algorithmically identified the major peaks in each of the shows' episodes, and explored the key dynamics for each peak.

The next session at AoIR 2015 starts with CCI graduate Jonathon Hutchinson, whose work is on the integration of user participation into the activities of public service media. User participation is not new, but in fact some form of user participation may just be interaction – there is a need to also make sure that participation is relevant, to both users and organisations.

A useful concept to use in this context is the idea of co-creation, bringing together users and organisations as mutual stakeholders in the participatory process. This may also result in a clash of heterarchical community and hierarchical organisational structures – and the organisational staff charged with managing institutional online communities are the ones to negotiate that clash. These community managers serve as cultural intermediaries between the two sides.

The final speaker in this AoIR 2015 session is Anja Bechmann, whose focus is on algorithms from the designer's point of view. Often, users are portrayed as the victims of victorious algorithms – but algorithms are only powerful if they have the right data to process.

We assume that algorithms are streamlining and simplifying activities and are sensitive to our wants and needs, and to do so most effectively they need to interact and interoperate with each other; algorithmic identity thus rests not on an essentialist but on a constructivist approach as identity is enacted when databases meet databases through algorithms.

Anja demonstrates this through the example of the Danish algorithm project Det Sociale Bibliotek (The Social Library), which draws on Facebook users' newsfeeds to present them with relevant library materials. It does not draw simply on their own posts, as the newsfeed also represents the interests of users' friends, and thus of their social environment.

The next speaker in this AoIR 2015 session is Annette Markham, who begins by asking about the voice of nonhuman agency. Nonhuman agency has long been recognised in Internet studies, but what is its voice: what are the hidden discourses of algorithmic structures; how do we give voice to technology; how may we represent it?

The key focus here is the rhetorical function of algorithms. Current discourse on algorithm is a theoretical, abstract levels, while it is also important to consider the level of everyday talk and put this into interaction with the theory. This doesn't just operate at the surface level of discourse, in fact, but also at a deep structural level explores the creation of new metaphors and meanings.