Just because something doesn't show up on Google, doesn't mean it's not there. That's the catch-cry of Shodan: a shady internet search engine that exists to find stuff some people are too dumb to secure.
Rather than finding stuff stored on internet-connected servers and computers like Google does, Shodan looks for the computers themselves. It finds stuff like unsecured security cameras, home automation devices and other gear that you probably shouldn't have access to.
Researchers have even reportedly found command and control systems for major infrastructure projects using Shodan.
Make sure you're securing those devices you have, folks. [CNN]