i want to suggest a few improvements:

1) allow the sound to get turned off, it's funny the first time only...
2) parse only articles in the #steemyornot category, decrypt the articles based on #3
3) create a wizard that integrates with steemimg and encrypts the payload (metadata and URL to image) using a multisignature encryption key composed of steemyornot.com key and a key generated for the user's account and particular post
4) user uploads this image to their steemit.com account (maybe can automate this somehow)
5) when user wants to make a post unreadable, you can simply trash that particular key (or if only stored on the client side, they can trash the key)

if you want to make it more elaborate, you would also use a seperate key on your side for each post, so if someone reports an inappropriate image you can delete the key, making it impossible to decrypt the markdown text or whatever you use (json) to id and create the content