A new study reveals that frequent exposure to online hate speech targeting Jewish Israelis following the Hamas attack on 7th October 2023, significantly increases symptoms of post-traumatic stress disorder (PTSD). Conducted by researchers at Hebrew University of Jerusalem and published in Scientific Reports, the findings highlight the psychological toll of digital hostility, particularly for those struggling to regulate emotions.
The research, led by Dr Dvora Shmulewitz, head of epidemiological research at the Israel Center for Addiction and Mental Health under the supervision of Professor Mario Mikulincer, surveyed nearly 4,000 Jewish Israeli adults two months after the attack. Using standardized clinical tools, the study found that 25% of respondents met the screening threshold for probable PTSD. Approximately 39% reported encountering hate speech on platforms such as Facebook, Instagram, and X at least weekly since the war began.
Each standard deviation increase in hate speech exposure was linked to a 2.2-point rise in PTSD scores, even after controlling for war-zone exposure, problematic technology use, and pre-existing psychiatric conditions. The association was especially strong among individuals with high emotion dysregulation, suggesting that emotionally vulnerable people face greater risk.
Dr. Shmulewitz underscored the seriousness of the findings: “This isn’t just about offensive language. Online hate can act as a form of digital terror, exacerbating the effects of trauma or even functioning as a traumatic event itself.” Professor Mikulincer added: “For people with high emotion dysregulation, the link between hate speech and PTSD was considerably stronger.” Both highlighted the urgent need for mental health services to address digital as well as physical trauma.
The study’s results align with wider concerns about the psychological impact of online hostility. A 2023 report by the Anti-Defamation League documented a surge in anti-Semitic content on social media following the 7th October attack, with platforms struggling to moderate effectively. The Hebrew University findings provide empirical evidence that such exposure translates into measurable psychological harm.
Proposed interventions include stronger moderation through AI-based tools to detect and remove harmful content, public awareness campaigns to highlight the mental health risks of online hostility, and clinical screening so that mental health professionals in conflict zones can assess digital trauma alongside physical exposure.
Dr Shmulewitz stressed the urgency: “This study should be a wake-up call. We can’t assume that what happens online stays online. For many, the emotional impact is deeply real and deeply damaging.” The study’s publication on September 10, 2025, marks a critical step in recognising how conflict now extends into digital spaces, leaving invisible but profound scars.
