UPDATE, 2:10 PM: The restructuring of Twitter management continues today, as the company’s Commerce Chief Nathan Hubbard has been appointed interim media head, CNBC is reporting. Twitter is subsequently holding a management retreat tomorrow to discuss the company’s future. Unsurprisingly, the uncertainty at the social media giant has also affected share prices, which were down 4.6% today.

PREVIOUS, January 24 10:17 PM:
Following reports this weekend that several top executives at Twitter have left the company, CEO Jack Dorsey tonight confirmed the news and elaborated on executive restructuring to follow. Taking to – where else – Twitter, Dorsey blasted what he called “inaccurate press rumors,” and said that Twitter SVP of engineering Alex Roetter, VP of HR Skip Schipper, head of media Katie Stanton and head of product Kevin Weil “have chosen to leave the company.”

Also departing the company is Vine product exec Jason Toff, but Dorsey did not mention him in his statement. Aside from spinning the departures as voluntary, Dorsey provided no details as to why the four were leaving, though he did praise them for their work during their tenures with the company and called them “phenomenal people.”

In the interim, Twitter COO Adam Bain will be “taking on additional responsibilities,” including the revenue-related product team, the Media team, and HR, while CTO Adam Messinger will be folding engineering and consumer product, design and research, user services, and Fabric under the auspices of a single group.

It’s been a rough few months for Twitter. In October, the company’s shares took a beating after it posted weaker than expected guidance for the final fiscal quarter. Twitter is widely used but has struggled recently in earnings and in increasing its membership.