In searching for an example ID I could use for applications, users, groups, networks and the like, I settled on 12345. It turns out, much to both my delight and surprise, that Facebook has actually assigned that ID to a user: Eli Richlin. So, my apologies to Eli for using him as an example throughout the book. Apart from being user 12345, Eli is apparently a Harvard graduate and an NYU grad student. Good luck with everything, Eli, and thanks for being such a model user!