I have three other historical examples of false information being given out by the news media:
* On the evening of August 12th, 1945 (six days after the atom bomb hit Hiroshima, there days after Nagasaki was hit by an A-bomb, and two days after Japan indicated they would surrender if Hirohito could stay; the Allies responded that Hirohito could stay but would be subject to control from the Allies) at 9:34 P.M. Eastern time, a false news bulletin hit the United Press wires noting that Japan had accepted Allied surrender terms.
But within a minute or two of that initial flash, UP issued a "Kill!" order, meaning the story was false. Japan did formally surrender, but it was not announced by Washington (and the other Allied capitols) until early on the evening of August 14th (Eastern time).
At
http://archive.org/details/1945RadioNews , you can scroll down and hear the false flash as reported on Mutual by anchor Gabriel Heatter, and a commentary by Cesar Searchinger (then of NBC News) which begins with a summary of the false flash.
* On March 30th, 1981, when President Reagan and White House Press Secretary James Brady was shot, a wire service (AP?) story falsely reported that Brady had been killed. Not long after, the White House issued a statement that Brady was still alive.
Many who are old enough to have been around that day recall watching ABC anchor Frank Reynolds puzzled, then pounding his fist on the anchor desk, angrily fuming "Let's Get This Thing Nailed Down! Let's Get This Thing Right!". If you're not old enough, or if you were watching another network at the time, you can find a clip of Reynolds' outburst on You Tube.
* Both of the above incidents happened long before the Social Media era, but the third incident happened just yesterday (April 23rd): A false tweet on the AP's Twitter account reported that there had been explosions at the White House and that President Obama had been injured. The AP shortly afterwards reported that that tweet was false, and that the account was hacked.