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The next speaker at Web Science 2016 is Jenna Mittelmeier, whose focus is on cross-cultural collaboration. Group work has always been difficult, and the majority of online contributions are from a small subset of all users; this free riding by non-participants is especially problematic in educational settings that require all users to participate equally.

How do users offline networks translate into their online collaboration practices? Jenna's study examined a group of 118 students in the UK, including 92% international students; these students varied from having highly homophilous to very country-diverse networks. These networks did not have any direct influence in …

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 …

The third speaker in this session at Web Science 2016 is Gefion Thuermer, whose interest is in decision-making processes within political parties. Such processes must be equal and inclusive, which may be a problem the more Internet-based communication tools play a role.

Attitudes towards such exclusion differ widely across parties. Greens politicians in Germany have traditionally been very concerned about avoiding exclusionary processes, while Pirate Party politicians assume that everybody is online and claim never to have met an 'Offline Pirate'. This means that the Green Party has traditionally developed its own processes and used Internet technologies only for administrative …

Next up at Web Science 2016 is Yelena Mejova, who presents a paper on the new 'quote retweet' feature that Twitter introduced in April 2015. This form of retweeting includes the retweeted tweet as a URL in the retweet, and can be used for somewhat different purposes from other forms of retweeting: while button retweets may imply an endorsement of the original message, the substantial space for including the retweeter's views in a quote retweet might be used for more critical engagement with the quoted material, for instance.

This study builds on the dataset of 192 US political accounts maintained …

I'm now in the "Politics and the Web" session at Web Science 2016, and we're starting with a paper by Pablo Loyola, whose focus is on politics in Chile. This work is interested in the collective decision-making processes involved in constructing new legislation, and builds on the voting behaviours of MPs and on drafts-in-progress of new bills. Are these processes influenced by the funding that MPs receive from corporate interests?

The project took a Web-centric approach to this: it identified Web content reflecting different ideological positions on a range of legislative issues, and using these corpora assessed the similarity …

Next at Web Science 2016 is Sergej Sizov, who focusses on the economic value of Web advertising. This is surprisingly difficult to calculate, and Sergej begins with the hypothetical example of a small Web advertising campaign. We may make a range of assumptions about click-through and purchase rates, but variance matters: in a substantial number of cases, campaigns may generate no profit whatsoever.

Each campaign constitutes a large number of small events (clicks, conversions, ...), and these can be modelled computationally; from these emerge certain predictions about the probability to make a given profit from the campaign.

Next up at Web Science 2016 is Claudia Orellana-Rodriguez, whose interest is in how journalists spread the news on Twitter. Journalists now regularly engage on social media platforms, but there still is only a very limited understanding of how platforms like Twitter can be used most effectively.

Optimal activities and user engagement may also differ considerably across different news categories: different types of news will have different audiences, and audience members may engage very differently with such news; this may also be affected by the time of day or week.

This project focussed on 200 Irish journalists and captured …

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 …

The next session at Web Science 2016 is on information dissemination and engagement. It begins with a paper by Miriam Fernandez, whose focus is on promoting behavioural changes to combat climate change. Over the past years, there have been multiple social media campaigns that promote more environmentally responsible behaviours; what can these campaigns learn from theories of behaviour change, and how can these theories be translated into computational methods?

The focus here is on Earth Hour 15, and on the COP21 summit in Paris in 2015. The project draws on the 5 Doors Theory, which describes five stages of behavioural …