RecSys Challenge 2020


The RecSys Challenge 2020 will be organized by Politecnico di Bari, Free University of Bozen-Bolzano, TU Wien, University of Colorado, Boulder, and Universidade Federal de Campina Grande, and sponsored by Twitter. The challenge focuses on a real-world task of tweet engagement prediction in a dynamic environment. The goal is to predict the probability for different types of engagement (Like, Reply, Retweet, and Retweet with Comment) of a target user for a set of tweets, based on heterogeneous input data.


Luca Belli, Sofia Ira Ktena, Alykhan Tejani, Alexandre Lung-Yut-Fon, Frank Portman, Xiao Zhu, Yuanpu Xie, Akshay Gupta, Michael Bronstein, Amra Delić, Gabriele Sottocornola, Walter Anelli, Nazareno Andrade, Jessie Smith, and Wenzhe Shi. 2020. Privacy-Preserving Recommender Systems Challenge on Twitter's Home Timeline, arXiv:2004.13715.

Participation and Data

Twitter has released a large public dataset of 160M public tweets, obtained by subsampling within ~2 weeks, that contains engagement features, user features, and tweet features.

If you are experiencing any issues, please notify the organizers.

Participation for this challenge is subject to the acceptance of these Terms & Conditions


Due to the reported possible data leakage, we want to emphasize and enrich some of the existing rules in the competition in order to discourage and prevent participants from taking advantage of it.

Please notice that no actual data leakage happened: The Twitter data provided are all publicly available via the API and de-anonymization of the dataset was always possible and expected. The following measures are just intended to ensure a fair competition.

The Terms & Conditions already require that all submissions are accompanied by reproducible code, so that we can inspect winning solutions in detail: “Your Submission must include the source code and any related information used to derive the results contained in your Submission. The source code must be released under an open-source license (Apache 2.0). A third party should be able to use your submitted source to regenerate your results.” Furthermore, we explicitly state in our rules that NO de-anonymization or access to data from Twitter users and user behavior from the Twitter API other than that in the challenge dataset is allowed. Enriching the data with other data sources remains possible.

If any of the rules mentioned in the Terms & Conditions (and explained further above) are broken and thus discovered by the organizers in the code submission, the participant(s) that the submission belongs to will be disqualified from the competition. As mentioned in the Terms and Conditions: “Organizers and Sponsor reserve the right, in their sole discretion, to disqualify any participant who makes a Submission that does not meet the Requirements or is in violation of these Terms.”

Timeline top

Note: the timeline is subject to slight modifications.

When? What?
March 2, 2020 Dataset Release & RecSys Challenge Starts

Training and validation datasets released

June 1, 2020 Test Dataset Release
June 15, 2020 RecSys Challenge ends
June 22, 2020 Announcement of the final leaderboard and winners Paper submission for RecSys Challenge Workshop
July 8, 2020 Paper Submission Due
August 5, 2020 Paper Acceptance Notifications
August 19, 2020 Camera-ready Papers Due
September 22-26, 2020 Workshop virtually taking place as part of the ACM RecSys conference.

Paper Submission Guidelines top

Submission website: EasyChair

Program Committee top

Academic Organizers top

Sponsor Mentors top

Advisors top