%A Nur Handayani Andika %T The Correlation Between Students? Activeness on X and Their English Writing Proficiency %X The widespread use of social media has raised concerns about its potential impact on students? academic skills, particularly their English writing proficiency. This study aimed to investigate the correlation between students? activeness on X (also known as Twitter) and their writing proficiency, as well as students? opinions about X and its effect on their English writing proficiency. In analyzing the data, this research adopted both quantitative and qualitative approaches, which was carried out by utilizing an ex post facto and phenomenological design with 30 students at SMAN 1 Pringsewu involved as the sample of this research. The instruments of this research were a questionnaire to analyze students? activeness on X, a writing assessment to measure students? writing proficiency, and followed by a semi-structured interview to further investigate students? opinions. The collected quantitative data were analyzed by using Pearson product-moment Correlation in SPSS 25. The result showed that the coefficient correlation between students? activeness on X is 0.784. Based on the result, it can be concluded that there is a positive significant correlation between students? activeness on X and their English writing proficiency. It means that students who actively use X tend to be better at writing than those who do not actively use X. Additionally, it was also found that students tend to hold positive opinions about the platform. Keywords: Correlation, Activeness, X/Twitter, Writing Proficiency, Students? Opinion. %C Universitas Lampung %D 2024 %I FKIP %L eprints80744