A social graph can also be described as a publicly articulated social network. [fact]
A social graph can also be described as a publicly articulated social network for a particular person. The term was coined by Facebook founder Mark Zuckerberg, and has been adopted by social network site researchers (Farber, "Facebook's Zuckerberg Uncorks the Social Graph"; Fitzpatrick, "Brad's Thoughts on the Social Graph").
Alice E. Marwick, Status Update, loc. 754