The postcards in the video were posted by anonymous people onto the website PostSecret, a project where users can create their own cards; sharing their darkest secrets and posting them to the website without giving their name or any other details.
The 1973 book Variable Piece 4: Secrets by the conceptual artist Douglas Huebler (one of many works in his Variable Piece series) was a compilation of nearly 1800 secrets written down by random people.
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Artwork from the site was blown up to poster size and used as the background in the 2005 All-American Rejects music video for "Dirty Little Secret."