A lackluster growth combined with a recent large stock sale by Rowghani has prompted the microblogging service to evaluate the need of a COO, Re/code said.

Chloe Sladden, Twitter's North America media head, who reports to Rowghani, has been reorganizing her unit and she may be preparing to leave the company, the website said.

Representatives at Twitter did not immediately respond to an email seeking comment.

Twitter's first-quarter results in April revealed slowing momentum at the company that exuberant investors just six months ago had argued could one day match Facebook's scale.

Agencies