Jeffrey Goldberg (@JeffreyGoldberg) tweeted at 6:39 PM on Mon, May 20, 2013: Jane Mayer gives us a cautionary tale about billionaires who tip poorly: http://t.co/1msMA36WhQ (https://twitter.com/JeffreyGoldberg/status/336468695624859650) Get the official Twitter app at https://twitter.com/download