what dataset did they use for this tool?
They collect data using the AYLIEN News API,  which provides search capabilities for news articles enriched with extracted entities and other metadata and take a step to compile a curated list of topics. The final dataset consists of 32,227 pairs of news articles and topics annotated with their stance. 
The proliferation of fake news and filter bubbles makes it increasingly difficult to form an unbiased, balanced opinion towards a topic. To ameliorate this, we propose 360{\deg} Stance Detection, a tool that aggregates news with multiple perspectives on a topic. It presents them on a spectrum ranging from support to opposition, enabling the user to base their opinion on multiple pieces of diverse evidence.
The growing epidemic of fake news in the wake of the election cycle for the 45th President of the United States has revealed the danger of staying within our filter bubbles. In light of this development, research in detecting false claims has received renewed interest BIBREF0 . However, identifying and flagging false claims may not be the best solution, as putting a strong image, such as a red flag, next to an article may actually entrench deeply held beliefs BIBREF1 . A better alternative would be to provide additional evidence that will allow a user to evaluate multiple viewpoints and decide with which they agree. To this end, we propose 360° INLINEFORM0 INLINEFORM1 Stance Detection, a tool that provides a wide view of a topic from different perspectives to aid with forming a balanced opinion. Given a topic, the tool aggregates relevant news articles from different sources and leverages recent advances in stance detection to lay them out on a spectrum ranging from support to opposition to the topic. Stance detection is the task of estimating whether the attitude expressed in a text towards a given topic is `in favour', `against', or `neutral'. We collected and annotated a novel dataset, which associates news articles with a stance towards a specified topic. We then trained a state-of-the-art stance detection model BIBREF2 on this dataset. The stance detection model is integrated into the 360° INLINEFORM0 INLINEFORM1 Stance Detection website as a web service. Given a news search query and a topic, the tool retrieves news articles matching the query and analyzes their stance towards the topic. The demo then visualizes the articles as a 2D scatter plot on a spectrum ranging from `against' to `in favour' weighted by the prominence of the news outlet and provides additional links and article excerpts as context. The interface allows the user to obtain an overview of the range of opinion that is exhibited towards a topic of interest by various news outlets. The user can quickly collect evidence by skimming articles that fall on different parts of this opinion spectrum using the provided excerpts or peruse any of the original articles by following the available links.