The final speaker in this Social Media and Society session is Yuri Rykov, whose focus is on the Russian social network site V Kontakte. What is the structure of online communities on this site? Are they flat, inclusive, and egalitarian, or are they stratified and hierarchical, with clear leadership structures emerging, as a power law distribution would expect? What new light can network analytics shed on these questions?

Past studies have examined online communities such as Yahoo! Answers and Slashdot, and (somewhat controversially) researchers at the Pew Center have even proposed the existence of six archetypical structures in …

The next paper in this Social Media and Society session is by my QUT colleague Brenda Moon and me. Our work-in-progress presentation explores how we can connect our long-term data on the structures of follower networks in the Australian Twittersphere with shorter-term comprehensive information on actual posting activity; we are interested how follower networks and @mention networks cross-influence each other. What emerges already from our preliminary work is that different communities of Australian Twitter users appear to exhibit some very different activity patterns, and that some appear more likely to break out of their follower/followee network clusters than others. One …

The next session at Social Media and Society starts with Sílvia Majó-Vázquez, whose interest is in the role and positioning of legacy news media in social media spaces, for the particular context of Spain's media ecology. Some legacy news media have recognised their own difficulties in engaging with the online space; some are significantly decreasing their offline activities and therefore need to improve their online services by comparison.

To what extent are new outlets recognised as prominent sources of information by other news providers, then; to what extend do they act as information brokers, even? This addresses two dimensions of …

The final speaker in this Web Science 2016 session is Amaç Herdagdelen, whose interest is in the experience of immigrants using social networks. On Facebook, for instance, information about one's migrant status can be included in one's profile information; by identifying users with a difference between their stated home country and country of residence, the present study identified some 93 home countries with more than 10,000 immigrants on Facebook, for migrants in the U.S.

Additionally, it computed the exposure of users to friends with a migrant background, and calculated the relative exposure to various countries of origin; the …

The next speaker at Web Science 2016 is Onur Varol, who points out the wide variety of purposes for which people use social media, and notes that we change our online persona and usage styles according to different communicative contexts. Can we match language style and user intent, then?

The project's experiments found that messages written using logical arguments are perceived as more authoritative, while an absence of logical content makes the sender appear more likeable; the communication style also varies across different fields of interest (products, health, politics).

URL cascades tend to be more likely to involve relatively similar …

The next session at Web Science 2016 starts with a paper by Jure Leskovec on information cascades. Such cascades emerge as users of social media platforms (re)share content through their networks, and the prediction of such processes is traditionally very difficult.

One question in such predictions is whether a given cascade will reach the median size observed in historical cascades; because of how the median is defined, even a blind guess on this question will have a 50% success rate.

But cascades on a platform like Twitter can consist of multiple cascade trees sharing the same information, as pieces of …

The final speaker in this Web Science 2016 session is Daniel Alexandrov, whose interest is in the use of social networking platforms in politics across the Caucasus region. This is a diverse and politically tense region, with several intractable political conflicts.

The project focussed on Armenia, Azerbaijan, Georgian, and pan-Caucasian groups on the social media platforms VKontakte – the "virtual Caucasus" space –, which is dominated by relatively young users and subdivides into a number of groups. These groups have overlapping memberships and distribute across a number of clusters; Caucasian and Georgian groups tend to have the highest betweenness centrality …

Next up at Web Science 2016 is Walid Magdy, whose focus is on social media commentary following the terrorist attacks in Paris in late 2016. Immediately after the attacks, sympathy with Paris was expressed on Twitter – but as the attacks were linked with Islamist terrorists, anti-Muslim messages also began to appear.

Walid's team tracked relevant keywords and hashtags on Twitter after the attacks, and noted that more than one tenth of all messages discussed Islam in some form; of these, some 336,000 tweets were closely engaged with the question of Islam in Europe. The majority of these tended to …