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Social media posts, mapping tools and a being aware of small but important details can help researchers determine when an undated image was taken.
via bellingcat: https://www.bellingcat.com/resources/2023/05/08/chronolocation-determining-when-a-photo-was-taken-using-facebook-google-street-view-and-assorted-tiny-details/
Essentially, any aspect of a source image could be of use, provided that it has changed over time. Sometimes clues will be so obvious that it’s possible to immediately figure out the rough date of the source image from one detail alone.