Jack Dorsey fashion design. As the service began to grow in popularity, Dorsey chose the improvement of uptime as top priority, even over creating revenue – which, as of 2008, Twitter was not designed to earn. Dorsey described the commercial use of Twitter and its API as two things that could lead to paid features. He describes his three guiding principles, which he says are shared by the company, as simplicity, constraint and craftsmanship. On October 16, 2008, Williams took over the role of CEO, while Dorsey became chairman of the board. On March 28, 2011, Dorsey returned to Twitter as Executive
Evan Spiegel Evan Spiegel Evan Thomas Spiegel (born June 4, 1990) is the co-founder and CEO of the American multinational technology and social media company Snap Inc., which he created (as Snapchat Inc.) with Bobby Murphy and Reggie Brown while they were students at Stanford University. Spiegel was named the youngest billionaire in the world in 2015. Evan was born in Los Angeles, California, to John W Spiegel and Melissa Ann Thomas, both lawyers. Spiegel grew up in Pacific Palisades, California, where he was raised Episcopalian. He was educated at the Crossroads School for Arts and Sciences in Santa Monica, and attended