Template for the Swedish national survey questionnaire directed to long-COVID / post-COVID sufferers in Swedish Facebook groups. The survey comprises questions on demographics, background factors, symptoms and changes over time, health impacts, information needs and practices, and validated scales for rating certain symptoms. The survey was produced for the research project CiLC-S - Crowdsourcing Long-COVID Sweden, and conducted in 2021. The survey is designed for anonymous participation and open digital methods distribution through social media and web channels.