TAO: how facebook serves the social graph. - Venkateshwaran Venkataramani; Zach Amsden; Nathan Bronson; George Cabrera III; Prasad Chakka; Peter Dimov; Hui Ding; Jack Ferris; Anthony Giardullo; Jeremy Hoon; Sachin Kulkarni; Nathan Lawrence; et al. (SIGMOD Conference, 2012)