Jack Dorsey Chairman after Dick Costolo replaced Williams as the CEO. On June 10, 2015, Costolo announced that he was resigning as CEO of Twitter, effective July 1, 2015. Dorsey would assume the post of Interim CEO upon Costolo's departure. He was named permanent CEO of Twitter on October 5, 2015. On the day after the controversy about Twitter's new algorithms for tweets, Dorsey responded to the trend, saying it was only a hoax. In May 2016, Dorsey announced that Twitter would not count photos and links in the 140-character limit to free up more space for text. This move was an
Sir Evan Williams, 1st Baronet Sir Evan Williams, 1st Baronet Sir Evan Williams, 1st Baronet, of Glyndwr (2 July 1871 – 3 February 1959) was a Welsh industrialist. As Chairman of the Monmouthshire and South Wales Coalowners Association and later President of the Mining Association of Great Britain, he exerted considerable influence on the mining industry in the UK. Williams was born at Pontarddulais, the son of mine-owner Thomas Williams, and was educated at Christ College, Brecon, and Clare College, Cambridge. Having taken over his father's business, Thomas Williams and Sons (Llangennech), Ltd, he became Chairman of the Monmouthshire and South Wales Coalowners Association in