New App Tells Who Defriended You iPhone app will keep you up to date on Facebook friends list By Evann Gastaldo, Newser Staff Posted Jan 15, 2010 12:36 PM CST 4 comments Comments Madisonville Mayor William Cox replies to question posted on his Facebook page with his iPhone Thursday, Feb. 5, 2009. (AP Photo/ Daniel R. Patmore) (Newser) – Want to know who unfriended you on Facebook? There’s an app for that. Defriended, released in Apple’s app store week, will scan your Facebook friends list, then rescan it each time you open the program, and alert you to any changes. The app will run you 99¢, ABC News reports—but a recent tweet seems to indicate Facebook may already have blocked it.