The hacker group published a YouTube video announcing their plan, and urging others to take down Facebook on November 5th.
Maybe that the group has created the new tool called #RefRef and they feel to use it for launching distributed denial of service against Facebook. I think the Facebook needs to take the warning seriously.
Anonymous argues that Facebook systematically violates user’s privacy, and as a usual practice, provides government agencies with sensitive, private user information. “Facebook knows more about you than your family” the video says.