Twitter, following in the same steps of Google, Facebook, Yahoo, and other big technology companies, published statistics regarding the diversity of their workforce.

As I would have guessed (and have observed in real life), most tech companies are (disproportionately, relative to the ethnic makeup of the United States) comprised of White males, especially in technical fields. Across the board (at Google, Twitter, Facebook, and Yahoo), only 1-2% of technical roles are filled by Black workers.