Debra Lee, who has been CEO of Viacom's Black Entertainment Television (BET) since 2005 and its chairman since 2006, has joined the board of Twitter. She tweeted out the news earlier today. Thrilled to be joining the @twitter board. It's transformed the media and the world like few other things in history (and continues to)!! — Debra Lee (@IamDebraLee) May 16…
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