There were worries after 9/11 that terrorists were using stego to plot attacks, posting their messages “hidden in plain sight” inside images on public websites.

There were worries after 9/11 that terrorists were using stego to plot attacks, posting their messages “hidden in plain sight” inside images on public websites. Someone (Niels Provos?) did a pretty thorough search and analysis of images on eBay and came up with nothing. Apparently it was just post-9/11 paranoia.