VaxxStance@IberLEF 2021: Overview of the Task on Going Beyond Text in Cross-Lingual Stance Detection

This paper describes the VaxxStance task at IberLEF 2021. The task proposes to detect stance in Tweets referring to vaccines, a relevant and controversial topic in the current pandemia. The task is proposed in a multilingual setting, providing data for Basque and Spanish languages. The objective is to explore crosslingual approaches which also complement textual information with contextual features obtained from the social network. The results demonstrate that contextual information is crucial to obtain competitive results, especially across languages.