Twitter CEO Jack Dorsey is stepping down as chief of the social media company, effective immediately. Parag Agrawal, Twitter’s chief technology officer, will take over the helm, the company said Monday. Shares of Twitter closed down 2.74{a78e43caf781a4748142ac77894e52b42fd2247cba0219deedaee5032d61bfc9} on the day. Dorsey, 45, was serving as both the CEO of Twitter […]