We have adopted the "Missing Children Page" on optimistan.org "404" error page. Feel free to do the same if you own a blod or website.
"Across the European Union, thousands of children go missing every year. Thanks to the NotFound project, you can make a difference. Install our application and a picture of a missing child automatically gets published on every ‘page not found’ of your website. Together, we can find them. See example."