Twitter CEO Parag Agrawal tasked to do a job Jack Dorsey struggled with

By naming Parag Agrawal as chief executive officer, Twitter Inc. is turning inward, choosing a low-profile technologist to steer a social network that has underperformed the market, haltingly introduced new products, and struggled to moderate harmful content under a leader long criticized for divided attention.

Agrawal, 37, was named on Monday to succeed co-founder Jack Dorsey after a four-year stint as CTO, a role where he oversaw Twitter’s pursuit of blockchain and other decentralized technologies. Dorsey, 45, will remain on the board through the summer and will stay at the helm of Square Inc., the payments company he also co-founded.