5, 2021, the Nigerian government issued an indefinite ban on Twitter usage in the country, citing "misinformation and fake news spread through it have had real world violent consequences", after the platform removed tweets made by the Nigerian President Muhammadu Buhari. Nigeria's ban was criticized by Amnesty International. In 2021, Twitter began the research phase of Bluesky, an open source decentralized social media protocol where users can choose which algorithmic curation they want. The same year, Twitter also released Twitter Spaces, a social audio feature; "super follows", a way to subscribe to creators for exclusive content; and a beta of "ticketed Spaces", which makes access to certain audio rooms paid. Twitter unveiled a redesign in August 2021, with adjusted colors and a new Chirp font, which improves the left-alignment of most Western languages. Since 2022 In June 2022, Twitter announced a partnership with e-commerce giant Shopify, and its plans to launch a sales channel app for U.S. Shopify merchants. On August 23, 2022, the contents of a whistleblower complaint by former information security head Peiter Zatko to the United States Congress were published. Zatko had been fired by Twitter in January 2022. The complaint alleges that Twitter failed to disclose several data breaches, had negligent security measures, violated United States securities regulations, and broke the terms of a previous settlement with the Federal Trade Commission over the safeguarding of user data. The report also claims that the Indian government forced Twitter to hire one of its agents to gain direct access to user data. Acquisition by Elon Musk Business magnate Elon Musk began speaking of buying Twitter, Inc. in early 2022, stating his concerns with the company's commitment to free speech and whether Twitter's moderation policies were undermining democracy. Musk reportedly planned major changes to Twitter's treatment of spambots, a more lenient content moderation policy, revamp of its offered services, and cost cuts. In the long-run, Musk expressed an intention to turn Twitter into an "everything app" like WeChat. Initially, Musk sought a position on the Twitter, Inc. Board of Directors by buying shares of the company; the Board created a "poison pill" to prevent Musk from gaining sufficient shares. Subsequently, Musk made an unsolicited offer to buy Twitter, Inc. for $43 billion on April 14, 2022. This process went through a number of business and legal confrontations; Musk ultimately completed the acquisition on October 27, 2022, for $44 billion.