Organized by
Knowledge 4 All Foundation

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Social Media and other online media sources play a critical role in distributing news and informing public opinion. At first it seemed that democratising the dissemination of information and news with online media might be wholly good – but during the last year we have witnessed other perhaps less positive effects.

The algorithms that prioritise content for users aim to provide information that will be ‘liked’ by each user in order to retain their attention and interest. These algorithms are now well-tuned and are indeed able to match content to different users’ preferences. This has meant that users increasingly see content that aligns with their world view, confirms their beliefs, supports their opinions, in short that maintains their ‘information bubble’. As a result, views have often become more polarised rather than less, with people expressing genuine disbelief that fellow citizens could possibly countenance alternative opinions, be they pro- or anti-brexit, pro- or anti-Trump.

This polarisation of views cannot be beneficial for society. As the success of Computer Science and more specifically Machine Learning have led to this undesirable situation, it is natural that we should now ask how Online Content might be prioritised in such a way that users are still satisfied with an outlet but at the same time are not led to more extreme and polarised opinions.

What is the effect of content prioritisation – and more generally, the effect of the affordances of the social network – on the nature of discussion and debate?  Social networks could potentially enable society-wide debate and collective intelligence. On the other hand, they could also enforce conformity within friendship groups, in that it is a daring person who posts an opinion at odds with the majority of their friends. Each design of content prioritisation may nudge users towards particular styles of both content-viewing and of content-posting and discussion. What is the nature of the interaction between content-presentation and users’ viewing and debate?

Content may be prioritised either ‘transparently’ according to users’ explicit choices of what they want to see, combined with transparent community voting, and moderators whose decisions can be questioned (e.g. Reddit). At the other extreme, content may be prioritised by proprietary algorithms that model each user’s preferences and then predict what they want to see. What is the range of possible designs and what are their effects? Could one design intelligent power-tools for moderators?

The online portal Reddit is a rare exception to the general rule in that it has proven a popular site despite employing a more nuanced algorithm for the prioritisation of content. The approach was, however, apparently designed to manage traffic flows rather than create a better balance of opinions. It would, therefore, appear that even for this algorithm its effect on prioritisation is only partially understood or intended.

If we view social networks as implementing a large scale message-passing algorithm attempting to perform inference about the state of the world and possible interventions and/or improvements, the current prioritisation algorithms create many (typically short) cycles. It is well known that inference based on message passing fails to converge to an optimal solution if the underlying graph contains cycles because information then becomes incorrectly weighted. Perhaps a similar situation is occurring with the use of social media?

The workshop will provide a forum for the presentation and discussion of analyses of online prioritisation with emphasis on the biases that such prioritisations introduce and reinforce. Particular interest will be placed on presentations that consider alternative ways of prioritising content where it can be argued that they will reduce the negative side-effects of current methods while maintaining user loyalty.


Either theoretical or practical - are welcomed in relevant areas including but not limited to the following directions:

Analysis of media:

  • Detection and prediction of emerging trends;
  • Detection of tribalism among online personas;
  • Detection of trolling, abuse, and fake news;
  • Intelligent tools for discussion moderators

Enhancement of content:

  • Automatic fact-checking;
  • Annotation according to viewpoint;
  • Visualisation and navigation of large on-line discussions

Enhancement of discussion:

  • Adapting improved message-passing algorithms for social media;
  • Gamification architectures and their effects on discussion;
  • Mitigation of tribalism

Algorithmic fairness:

  • What does it mean for an algorithm to be ‘fair’ in content prioritization?
  • Nicolo Cesa-Bianchi, Università degli Studi di Milano
  • Massimiliano Pontil, Istituto Italiano di Tecnologia and University College, London
  • John Shawe-Taylor, University College, London
  • Chris Watkins, Royal Holloway, London
  • Emine Yilmaz, University College, London
Day 1
15:00‑16:00 Welcome

John Shawe Taylor, Director of K4A and Head of Computer Science Dept. University College London

16:00‑16:30 Keynote: Setting the Stage
Chris Watkins, Royal Holloway, London
16:30‑17:00 Coffee Brake
17:00‑19:00 Presentation Groups:
1. Presentation 12. Presentation 2
3. Presentation 3
4. Presentation 4
19:30 Dinner
Day 2
9:30‑10:30 Keynote
Sebastian Riedel, University College London
10:30‑11:00 Coffee Brake
11:00‑13:00 Presentation Groups:
1. Presentation 12. Presentation 2
3. Presentation 3
4. Presentation 4
13:00‑14:30 Lunch
14:30‑15:30 Keynote
Andreas Vlachos, University of Sheffield
15:30‑16:00 Coffee Brake
16:00‑18:00 Presentation Groups:
1. Presentation 12. Presentation 2
3. Presentation 3
4. Presentation 4
18:00‑18:30 Panel Presentation
19:30 Dinner
Day 3
9:30‑10:30 Keynote
Marko Grobelnik, Institute Jožef Stefan
10:30‑11:00 Coffee Brake
11:00‑13:00 Presentation Groups:
1. Presentation 12. Presentation 2
3. Presentation 3
4. Presentation 4
13:00‑13:30 Conclusions from the Chairs of Groups: Synthesis of Outputs
13:30‑14:30 Lunch
  • Chris Watkins, Royal Holloway, London
  • Emine Yilmaz, University College, London
  • Sebastian Riedel, University College, London
  • Andreas Vlachos, University of Sheffield
  • Marko Grobelnik, Jozef Stefan Institute


Hotel Villa Pagoda, Via Capolungo 15, 16167 Genova Nervi, Italy
Tel +39 010 32 32 00
Fax +39 010 32 12 18

How to get here

The hotel is approximately 25 km from Genoa's Airport and about 12 km from the center of town. Travel to the hotel by taxi from the airport will cost approximately 30-35 Euros.


Villa pagoda has 17 rooms, if you need more another good hotel nearby is Astor hotel (, same category, about 1 km from Villa Pagoda. You can apply the same prices (95,00 euro for a double room single use and 125,00 euro for a double room).

If anyone would like to come as early as Saturday 25th, the hotel could open in advance for a minimum of 6 rooms at least. It 's our practice to require a confirmation by credit card to guarantee the reservation and the date for the confirmation is March the 10th.

Submissions will be received electronically via Easychair. Please do not send us your full-paper by email.

Submission Procedure

Submitted papers should be uploaded through the Easychair conference management system. To submit your paper, please follow the instructions below.

  1. Log in to EasyChair using the following link:
  2. Upon a successful login, you will see the Main Interface. Click on 'My Submissions'.
  3. Click on ‘Submit a new version’ at the right side.
  4. Select the file to upload and make sure that it is in only Microsoft Word format (.doc)
  5. Finally, press the 'Submit a New Version’ button to complete the submission. You will receive a confirmation e-mail that your submission was successful.
  6. Please do not send us your full-paper submissions by email.