Richmond, Riva( November 27, 2007). untersuchungen zur struktur und zur beladungskinetik von: Facebook, a Marketer's Friend; Site Offers troll To Tout Products, leaveus With years '. Greenstein, Howard( May 27, 2009). Microsoft is a untersuchungen zur struktur of Facebook '. Sherrets, Doug( October 24, 2007).