Frederic Jacobs produced an iOS app called "Angry Syrians," which was apparently blessed by Rovio. It was intended to raise awareness of the ongoing bloodbath in Syria. Apple rejected it because "We found your app contains defamatory or offensive content targeted at a specific group, which is not in compliance with the App Store Review Guidelines." (the defamed and offended group in question is the brutal Assad regime and its supporters). (via Hacker News)