This is a really funny story in that it shows just how many people didn't think to use adequate security (including some CS depts at universities) when they enabled the web access options for their printers.
But it's really not as funny as it first appears. I took a close look at the Google search results which show the list of accessible printers. Click through to the second page and suddenly the list will end after 13 links. So far as I can tell that figure of 86,700 accessible printers is bogus. It's caused by some type of bug in the search result counter.
Aren't you glad when I double check my sources? I am.
image by tawalker