Twitter says its chief operating officer, Ali Rowghani, has resigned from his post but will stay with the company as a strategic adviser to CEO Dick Costolo.
Rowghani joined Twitter in 2010 as chief financial officer and became COO two years later. Before that, he served as CFO at Pixar Animation Studios.
Twitter Inc. says it will not name a replacement for Rowghani and did not give a reason for his departure. His responsibilities will be shifted to other executives.
The San Francisco-based social media company has been trying to broaden its user base, most recently by luring in World Cup fans who want to follow teams and players using its service.
As Re/code's Kara Swisher reported last night, before the resignation was made public, Rowghani was instrumental in working with Nielsen on the Twitter ratings system, and also a big booster for the company's abandoned bid for SoundCloud.