Documenting unauthorized use, calmly
If you find your work somewhere unexpected, the first job is to preserve — not to accuse.
Preserve first
Record the URL, the date, a screenshot, and any context before anything changes. A finding record keeps this safely in your archive.
Then understand
Compare the images, check your sharing and licensing records, and consider whether the use might be authorized, your own post, or genuinely unknown. From there you can decide on a calm, proportionate response.