I am not one that checks my daughter's txts every night, but I do educate her that her actions can have farther reaching consequences than a young person might think at the time. Doesn't the false sense of privacy that this app creates give you concern that your daughter and her group of friends might overshare and create problems for themselves or others? The content does not go away, there is no way to prevent that. There have already been several workarounds (hacks) to persist the images being sent and I could think of a few more low tech solutions (second camera to take a photo of the snapchat screen is one that comes to mind).