As tech companies like Twitter, Apple and Uber soar, they've also come under increased scrutiny for their lack of diversity. According to a recent report, Twitter's workforce includes just 1 percent African-American and 3 percent Latino employees in the U.S., and 13 percent women employees in its global workforce — this, despite Twitter emerging as an important space for underrepresented voices and activist efforts. Leslie Miley, a former Twitter engineering manager, who was the only black engineer in a leadership position at the company, recently resigned from his position and penned several articles critiquing Twitter's diversity policies.