Facebook uses TAO for graphs: https://www.facebook.com/notes/facebook-engineering/tao-the-power-of-the-graph/10151525983993920 https://www.facebook.com/notes/fa

Facebook uses TAO for graphs: https://www.facebook.com/notes/facebook-engineering/tao-the-power-of-the-graph/10151525983993920 https://www.facebook.com/notes/facebook-engineering/tao-the-... MySQL is used for storing textual user content like comments, etc. See https://www.facebook.com/MySQLatFacebook https://www.facebook.com/MySQLatFacebook Photos are stored using specialized systems: https://www.facebook.com/note.php?note_id=76191543919 https://www.facebook.com/note.php?note_id=76191543919 http://www.stanford.edu/class/cs240/readings/haystack.pdf http://www.stanford.edu/class/cs240/readings/haystack.pdf And you can see some pictures of our new data center used for cold storage of older photos: http://readwrite.com/2013/10/16/facebook-prineville-cold-storage-photos http://readwrite.com/2013/10/16/facebook-prineville-cold-sto...