Twitter has hired Jeffery Siminoff, a 50-year-old former Apple executive, as its new (air quotes, please) “vice president of diversity and inclusion.” There is a problem with this picture. Siminoff is very white. Before Apple, he was at very white Morgan Stanley, where he ran diversity. Worth noting: Twitter's greatest penetration is in the Middle East and Africa. Black and Hispanic adults make up more than 30% of the company’s U.S. users, and less than 5% of its management.