CNN: Twitter stock jumps after report says CEO Jack Dorsey to step down. >"Shares of Twitter jumped as much as 10% in pre-market trading Monday on the heels of a report that CEO Jack Dorsey intends to step down. The report, from CNBC, has not been independently verified by CNN."

CNN: Jack Dorsey is stepping down as CEO of Twitter. >"Jack Dorsey, the cofounder and public face of Twitter, will step down from his role as CEO, effective immediately, the company announced Monday. Dorsey will remain a member of Twitter's board until at least next year."