PostSecret is either a great hoax or a fantastic exercise in appropriated media and human sociology. People mail in secrets anonymously on postcards. Nominally the cards are homemade, but many of the posted images are commercial and reused. Many of the texts are also cut-and-pasted, ransom-note style. The taking and use of others' images and typography to convey what are supposed to be intensely personal messages is fascinating postmodern commentary. I do think it's slightly disappointing that it's run out of a single centralized blog; imagine PostSecret as done over a P2P network!