I used to get messages from facebook too, even though I had notifications completely turned off. I noticed that all but one check box below the master off check box was still checked, but it was greyed out. So I turned the master back on and I unchecked the one green check mark, so now they were all turned off, and then turned off the master check mark. Now I don't get anything. It was some sort of bug. Just make sure that every check mark is unchecked before turning the master off and it should keep you from getting any messages. I noticed it was on when I tried to shut down the facebook background processes when it kept turning the program back on two seconds later. I unchecked every box and now it stays off.