Twitter CEO, Jack Dorsey, announced the departure of Alex Roetter, the head of engineering team, Kevin Weil, the product chief, Skip Schipper, the vice president of human resources and Katie Stanton, the head of media. Jack said that Kevin and Alex lead the engineering teams and ranged the ads product.

Late Sunday, Jack said at his @Jack Twitter account he is grateful to all the four people for their contribution to Twitter and he calls them "phenomenal people."

Moreover, Jack also said that Adam Bain, COO of Twitter, will be handling additional responsibilities, including the revenue related product group, HR team and the Media group on a temporary basis. While, Adam Messinger, the company's CTO, will be handling consumer and engineering products, research and design, Fabric and user services into one team. Jack also noted that he will be teaming with Adam to build right experience.

Business Insider said that the social network will not appoint a successor to Kevin Weil, the resigning head of product. As Adam Messinger has a lot of stuff to work with, Jack Dorsey will be the next product boss. Jack Dorsey, the creator of Square and Twitter, will be able to infuse bold product modification which has been lacking at the company, according to Business Insider.

In addition, as a creator of the company, Jack Dorsey will have the moral power to execute basic alterations to the core product that could be anything from banishing the 140 character limit to something even higher.

Nathan Hubbard, the company's head of commerce, was appointed as head of media temporarily, CNBC said citing sources with knowledge of the matter. This change was reported in an email to staffs, which also mentioned that the company is having a meet in San Francisco to review the future of the social network. The company is expected to announce a chief marketing officer shortly, according to reports.

According to sources, the social networking site has failed to attract new users and the overhaul of key executives is taking place in order to reshape the company. Twitter's shares jumped almost 55 percent in the previous year.

Recently, the company named Jeffrey Siminoff as VP of inclusion and diversity, and promoted Jeff Seibert to be the head of consumer product.

"A greater clarity of our purpose, our objectives and putting the people that use Twitter first drives the urgency we now feel. You should expect Twitter to be as easy as looking out your window to see what's happening," Jack Dorsey said.