That whirring sound you hear is the rumor mill kicking into high gear, probably splashing water everywhere (it is a mill) while it gets to spinning: Facebook has issued a mysterious invitation for the media to come hang out on its campus in Menlo Park, Calif. next Tuesday and of course, now everyone’s all abuzz as to what it is the social network has to share with us. Could it be a phone? A new superhero? A fancy haircut for Mark Zuckerberg? [More]