The "Spying Birds" picture that was posted on the hacked Angry Birds website.
The Angry Birds' website was recently hacked by an "anti-NSA" group after the NSA-GCHQ(NSA's British counterpart) documents were leaked, which revealed that Angry Birds' developer Rovio was providing NSA and GCHQ information of the people who installed Angry Birds on an Android device. NSA and GCHQ have been working together for years for going into new ways for obtaining information.
The New York Times, ProPublica and The Guardia all posted the documents which were obtained from Edward Snowden. The documents had information of how Rovio was working with NSA and GCHQ and gave out information of those who installed Angry Birds on an Android device which includes age, gender, location and if the users are listening to music or even making a call.
The website was quickly recovered by Rovio after the hacking. The hackers put a hilarious picture of Angry Birds which had the title "Spying Birds" and has an NSA logo on the head of the red bird(picture above).
Rovio has stated that user information is not compromised and is safe and declines giving information to any agency.