Deteksi Validitas Berita pada Media Sosial Twitter dengan Algoritma Naive Bayes

Banyaknya berita-berita online sering menarik minat masyarakat untuk membacanya, tetapi kadang dengan terlalu banyaknya berita tersebut membuat orang susah mendapatkan informasi yang terpercaya. Berita palsu merupakan kumpulan kata atau kalimat yang mengandung informasi yang tidak benar yang berupaya untuk membohongi atau mengarahkan pembaca atau pendengarnya agar mendukung atau percaya dengan isi beritanya. Penyebar berita palsu umumnya mengetahui bahwa berita yang disebarkan tidak benar. Tujuan penelitian ini adalah mendeteksi berita palsu yang tersebar pada media sosial. Dalam mengklasifikasi berita palsu, deteksi validitas berita digunakan algoritma naïve bayes sebagai kategorisasi teks berbasis pembelajaran mesin. Penelitian ini juga membangun website yang menyediakan fitur web service, pencarian berita yang ada di Twitter, dan klasifikasi berita secara manual. User interface merupakan website berbasis PHP dimana pengguna dapat melakukan interaksi secara langsung sepeti komentar, login, atau melihat artikel-artikel yang sudah diklasifikasi. Sedangkan back-end dari website ini adalah program klasifikasi teks berbasis Python. Dari percobaan yang telah dilakukan ternyata algoritma Naïve Bayes dapat digunakan untuk mengklasifikasi berita palsu. Berdasarkan eksperimen, penggunaan metode naive bayes untuk deteksi validitas berita dengan data uji media social Twitter dapat mencapai nilai akurasi dengan persentase terbaik yaitu 92% pada data ujicoba sebesar 309 artikel

Deteksi Validitas Berita pada Media Sosial Twitter dengan Algoritma Naive Bayes

Banyaknya berita-berita online sering menarik minat masyarakat untuk membacanya, tetapi kadang dengan terlalu banyaknya berita tersebut membuat orang susah mendapatkan informasi yang terpercaya. Berita palsu merupakan kumpulan kata atau kalimat yang mengandung informasi yang tidak benar yang berupaya untuk membohongi atau mengarahkan pembaca atau pendengarnya agar mendukung atau percaya dengan isi beritanya. Penyebar berita palsu umumnya mengetahui bahwa berita yang disebarkan tidak benar. Tujuan penelitian ini adalah mendeteksi berita palsu yang tersebar pada media sosial. Dalam mengklasifikasi berita palsu, deteksi validitas berita digunakan algoritma naïve bayes sebagai kategorisasi teks berbasis pembelajaran mesin. Penelitian ini juga membangun website yang menyediakan fitur web service, pencarian berita yang ada di Twitter, dan klasifikasi berita secara manual. User interface merupakan website berbasis PHP dimana pengguna dapat melakukan interaksi secara langsung sepeti komentar, login, atau melihat artikel-artikel yang sudah diklasifikasi. Sedangkan back-end dari website ini adalah program klasifikasi teks berbasis Python. Dari percobaan yang telah dilakukan ternyata algoritma Naïve Bayes dapat digunakan untuk mengklasifikasi berita palsu. Berdasarkan eksperimen, penggunaan metode naive bayes untuk deteksi validitas berita dengan data uji media social Twitter dapat mencapai nilai akurasi dengan persentase terbaik yaitu 92% pada data ujicoba sebesar 309 artikel

A Retrospective Analysis of the Fake News Challenge Stance Detection Task

The 2017 Fake News Challenge Stage 1 (FNC-1) shared task addressed a stance classification task as a crucial first step towards detecting fake news. To date, there is no in-depth analysis paper to critically discuss FNC-1's experimental setup, reproduce the results, and draw conclusions for next-generation stance classification methods. In this paper, we provide such an in-depth analysis for the three top-performing systems. We first find that FNC-1's proposed evaluation metric favors the majority class, which can be easily classified, and thus overestimates the true discriminative power of the methods. Therefore, we propose a new F1-based metric yielding a changed system ranking. Next, we compare the features and architectures used, which leads to a novel feature-rich stacked LSTM model that performs on par with the best systems, but is superior in predicting minority classes. To understand the methods' ability to generalize, we derive a new dataset and perform both in-domain and cross-domain experiments. Our qualitative and quantitative study helps interpreting the original FNC-1 scores and understand which features help improving performance and why. Our new dataset and all source code used during the reproduction study are publicly available for future research

COVID-19 misinformation on Twitter: the role of deceptive support

2022 Summer.Includes bibliographical references.Social media platforms like Twitter are a major dissemination point for information and the COVID-19 pandemic is no exception. But not all of the information comes from reliable sources, which raises doubts about their validity. In social media posts, writers reference news articles to gain credibility by leveraging the trust readers have in reputable news outlets. However, there is not always a positive correlation between the cited article and the social media posting. Targeting the Twitter platform, this study presents a novel pipeline to determine whether a Tweet is indeed supported by the news article it refers to. The approach follows two general objectives: to develop a model capable of detecting Tweets containing claims that are worthy of fact-checking and then, to assess whether the claims made in a given Tweet are supported by the news article it cites. In the event that a Tweet is found to be trustworthy, we extract its claim via a sequence labeling approach. In doing so, we seek to reduce the noise and highlight the informative parts of a Tweet. Instead of detecting erroneous and invalid information by analyzing the propagation patterns or ensuing examination of Tweets against already proven statements, this study aims to identify reliable support (or lack thereof) before misinformation spreads. Our research reveals that 14.5% of the Tweets are not factual and therefore not worth checking. An effective filter like this is especially useful when looking at a platform such as Twitter, where hundreds of thousands of posts are created every day. Further, our analysis indicates that among the Tweets which refer to a news article as evidence of a factual claim, at least 1% of those Tweets are not substantiated by the article, and therefore mislead the reader

TALKING ABOUT JUSTICE: PREDICTING ACTOR ENGAGEMENT ON SOCIAL MEDIA AFTER A GALVANIZING EVENT

Social media contributes to discourse around and framing of major societal issues, and enables community formation, social change, and activism. It provides opportunities to engage in discourse, gain and share knowledge, and form ties with others around an issue, topic, or cause. This dissertation explores how justice, an important concept underlying social systems, is expressed in Twitter data in the context of high-salience, galvanizing local events, and leverages that information to predict whether newcomers to the issue will continue their digital engagement on the topic over time. It also attempts to quantify whether, and how much, a set of factors or dimensions previously associated with engagement in the physical realm contribute to digital engagement. These dimensions—identity, emotion, effort, and social embeddedness—are informed by prior work on social movements, digital activism, and related fields. Rather than rely on hashtags, this dissertation uses machine learning to detect justice-related Twitter activity. This advance in methods provides a richer understanding of discourse around a complex, multifaceted topic like justice. It allows deeper insight into the social media activity of newcomers to the justice community, and the networks they are embedded in. The approach is developed and applied first to Twitter data from Baltimore around the 2015 death of Freddie Gray from injuries sustained while in police custody, and the protests and riots that followed in Baltimore. To test for generalizability, the same approach is then applied to a second dataset, collected from Cleveland at the time of the death of Tamir Rice, who was shot and killed by police in 2014. Findings show that digital engagement in justice discourse on social media can be predicted, based on aspects of social embeddedness, emotion, and effort. To the degree that committed individuals are at the heart of social movements and efforts to spur social and civic change, and forming and being embedded in appropriate network structures is critical for channeling commitment into action and eventual success, this work contributes to greater understanding of these phenomena. Findings from this research could contribute to the design of technology to support civic engagement through social media platforms