Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Facebook Was Hacked But All Your Information Is Still Safe And Secure
Facebook, one of the most popular websites around the world is always under attack from hackers but it seems that some of them were successful sometime last month. The company today confirmed that they have no evidence that users information had been compromised.
“We have found no evidence that Facebook user data was compromised.”