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Tesla CEO Elon Musk has acquired a 9% stake in Twitter to become its largest shareholder while joining other critics in questioning the social media platform鈥檚 dedication to free speech and the First Amendment.

Mr. Musk鈥檚 ultimate aim in acquiring 73.5 million shares, worth about $3 billion, isn鈥檛 clear. Yet in late March Mr. Musk, who has 80 million Twitter followers and is active on the site, questioned free speech on Twitter and whether the platform is undermining democracy.

In years past, Twitter and other social platforms have taken fire for allowing harmful speech ranging from incitement to violence to coordinated harassment and racial abuse. More recently, these platforms have made concerted efforts to rein in such behavior, often drawing criticism similar to Mr. Musk鈥檚 from the political right. Both Twitter and Facebook faced blowback after suspending the accounts run by former President Donald Trump following the Jan. 6 Capitol insurrection last year.

It鈥檚 unclear just when Mr. Musk bought the stake. A U.S. Securities and Exchange Commission filing made public on Monday says the event triggering the filing happened March 14. Mr. Musk has also raised the possibility with his massive and loyal Twitter following, that he could create a rival social media network.

Industry analysts and legal experts say Mr. Musk could begin advocating for changes at Twitter immediately if he chooses. In a note to investors, CFRA Analyst Angelo Zino wrote that Twitter could be viewed as an acquisition target because the value of its shares has been falling since early last year.

Twitter co-founder Jack Dorsey stepped down as CEO in November. Mr. Musk鈥檚 stake in Twitter is now more than four times the size of Mr. Dorsey鈥檚, who had been the largest individual shareholder.

鈥淢usk鈥檚 actual investment is a very small percentage of his wealth, and an all-out buyout should not be ruled out,鈥� wrote Mr. Zino, who covers Twitter and social media.

Mr. Musk could see Twitter as an investment with big growth ahead, or he could have noninvestment reasons for the purchase, such as buying to make sure the platform doesn鈥檛 restrain his speech, said Erik Gordon, a law and business professor at the University of Michigan.

鈥淲hat he could be worried about is if enough of his tweets start to look like disinformation, that Twitter says 鈥榳e鈥檙e doing our job against disinformation,鈥欌�� Mr. Gordon said. No CEO would refuse to take a call from the company鈥檚 top shareholder, so the purchase gives Mr. Musk access to Twitter鈥檚 top management, he said.

Mr. Musk has not spoken specifically about any Twitter rule changes he might push, but the social media platform鈥檚 history of suspensions and bans is well documented.

Mr. Trump鈥檚 suspension from both Twitter and Facebook has raised difficult questions about free speech in a social media industry dominated by a few tech giants聽鈥� an issue that Mr. Trump and conservative media have seized upon. There was broad praise for Mr. Musk from those circles Monday.

Michael Flynn, the retired general who served briefly as Donald Trump鈥檚 national security adviser, and who was suspended from Twitter in January 2021, sent Mr. Musk some free advice via Telegram.

鈥淗ey Elon, how about letting all of those dropped from twitter for being America First and Pro-Trump back on Twitter!!!,鈥� Mr. Flynn wrote.

Twitter earlier this year banned the personal account of far-right U.S. Rep. Marjorie Taylor Greene for multiple violations of the platform鈥檚 COVID-19 misinformation policy. Other people banned in recent years include Steve Bannon, for suggesting the beheading of Dr. Anthony Fauci, former Ku Klux Klan leader David Duke for breaking the social media site鈥檚 rules forbidding hate speech, and right-wing conspiracy theorist Alex Jones and his Infowars show for abusive behavior.

Mr. Musk recently described himself on Twitter as a 鈥渇ree speech absolutist鈥� in explaining why the Starlink satellite internet service聽鈥� part of his aerospace company SpaceX聽鈥� would not block Russian state media outlets, which have spread propaganda and misinformation in line with the Kremlin鈥檚 narrative on its war in Ukraine.

But such absolutism would not be welcomed by advertisers who are Twitter鈥檚 chief revenue source, said Brian Wieser, global president of business intelligence at GroupM. Brands that advertise on Twitter strongly prefer some content standards because a toxic platform can drive many other users away.

鈥淐ertain kinds of speech, such as advocating an insurrection or advocating hurting people, are not the kinds of things most advertisers want to support,鈥� said Mr. Wieser, who analyzes the media industry for advertisers.

Twitter鈥檚 stock surged nearly 30% Monday. Since March 14, the date listed on filing by Twitter, its shares are up nearly 50%, meaning that Mr. Musk鈥檚 investment has paid handsomely聽鈥� so far.

Twitter did not immediately respond to a request for comment.

In March, Mr. Musk told his millions of followers on Twitter that he was 鈥済iving serious thought鈥澛爐o creating his own social media platform, and has clashed repeatedly with financial regulators about his use of Twitter.

Mr. Musk is locked into a bitter dispute with the SEC over his ability to post on Twitter. His lawyer has contended in court motions that the SEC is infringing on the Tesla CEO鈥檚 First Amendment rights.

In October of 2018, Mr. Musk and Tesla agreed to pay $40 million in civil fines and for Mr. Musk to have his tweets approved by a corporate lawyer after he tweeted about having the money to take Tesla private at $420 per share.

The funding was far from secured and the electric vehicle company remains public, but Tesla鈥檚 stock price jumped. The settlement came after the SEC brought a securities fraud charge. It specified governance changes, including Mr. Musk鈥檚 ouster as board chairman, as well as pre-approval of his tweets.

Mr. Musk鈥檚 lawyer is now asking a U.S. District Court judge in Manhattan to throw out the settlement, contending that the SEC is harassing him and infringing on his First Amendment rights.

The SEC says it has legal authority to subpoena Tesla and Mr. Musk about his tweets, and that Mr. Musk鈥檚 move to throw out the settlement is not valid.

The SEC also disclosed that it is investigating Mr. Musk鈥檚 Nov. 6, 2021 tweets that asked followers whether he should sell 10% of his Tesla stake. The commission said it issued administrative subpoenas while investigating whether Mr. Musk and Tesla are complying with disclosure controls in the 2018 agreement.

Mr. Musk ended up selling more than 15 million shares worth roughly $16.4 billion. With some sales in late December, Mr. Musk is close to selling 10%.

This story was reported by The Associated Press. Matt O鈥橞rien and Michelle R. Smith contributed from Providence, Rhode Island. Tom Krisher reported from Detroit.