Mark Zuckerbergs sisters name is Randi Jayne Zuckerberg. She was born on February 28, 1982, and is an American businesswoman. Randi is the former director of market development and spokesperson for Facebook, and she was one of Facebooks first employees. She is also the founder and CEO of Zuckerberg Media, editor-in-chief of Dot Complicated, and creator of Dot, an animated television show. Randi has won two Tony Awards for her Broadway musicals.