After writing about Facebook personal privacy issues recently I met a developer at a Thinking Digital dinner tonight that has created a web application that exploits user data from Facebook to dramatic effect.

Tom Scott (@tomscott) has built his Evil app using the Graph API to search public groups about lost phones. The web app randomly displays the private phone numbers of unsuspecting Facebook users.

Scott says that his intention is highlight personal privacy issues on Facebook and has truncated the displayed numbers to make his point.

Evil follows a long line of projects by Scott who describes himself as a geek comedian. Check out and enjoy Breaking the News Salmon in a Dishwasher, The Google Street View Race and other projects on his site.