tl;dr: The action is motivated because of the poor privacy policy of Facebook.
As said in other comments, it isn't clear if this is Anonymous because their twitter accounts didn't echo the manifesto. It could be a spinoff, a false flag op, or anything in between.
http://blogs.villagevoice.com/runninscared/2011/08/anonymous...
tl;dr: The action is motivated because of the poor privacy policy of Facebook.
As said in other comments, it isn't clear if this is Anonymous because their twitter accounts didn't echo the manifesto. It could be a spinoff, a false flag op, or anything in between.