Check out this thread about a guy asking for information on the b737 back up systems and then some mod banning him because he was scared that the person was a reporter trying to do damage to the industry.
Youd think that being rude to people asking about back up systems would be worse for the industry?
http://www.talkairline.com/showthread.php?235-Flight-control-system-redundancy-and-hardovers/page2&s=c9bdd1837ac19225a35d6c73d629aef5