Dorsey's journey from microblogging pioneer to billionaire

FILE PHOTO: Twitter's Chairman Jack Dorsey attends a photocall in the Westbury Hotel to mark the opening of Founders in Dublin October 28, 2010. REUTERS/Cathal McNaughton/File Photo

(Reuters) - Jack Dorsey on Monday stepped down as the chief executive officer of Twitter Inc, the social media firm he helped found in 2006 and steered through a high-profile hack and the controversial banning of former U.S. President Donald Trump.

Dorsey, who also helms fintech firm Square Inc, will be succeeded by Chief Technology Officer Parag Agrawal.