1. Make an image that depicts a secret your character is hiding, ala PostSecret. 2. Post the image here, anonymously. 3. People will guess who each secret belongs to. 4. When it is guessed correctly, you must reveal! 5. ... 6. PROFIT!
Since posting anonymously tends to give image links instead of the actual image, you can cheat this by making an empty table and setting the image as the background. Just make sure you define the table to fit the exact height and width of the image by replacing VALUE and putting the image location where it says URL.