By Brendan Sasso - 10/05/12 04:38 PM EDT
Lockhart served as the White House press secretary under President Clinton from 1998 to 2000. He also worked on Sen. John Kerry's (D-Mass.) 2004 presidential bid, Clinton's 1996 run and other Democratic campaigns. He co-founded Glover Park Group, a Washington-based communications firm.
Lockhart joined Facebook in July of last year.