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Tesla CEO Elon Musk stands to be the next owner of Twitter, having pledged roughly $44 billion to buy the social platform and take it private. Assuming that happens, next up on his agenda will be planning how to fulfill his promises to develop new Twitter features, open its algorithm to public inspection, and defeat 鈥渟pambots鈥� on the service that mimic real users.

He鈥檒l also need to have the company start 鈥渁uthenticating all humans,鈥� as he described it in a statement quoted in the Monday press release announcing the acquisition. What exactly Mr. Musk meant by the phrase remains unclear.

So does the question of whether his ideas are technologically possible and how we鈥檒l know if these changes would benefit users or serve some other purpose.

Experts who have studied content moderation and researched Twitter for years have expressed doubt that Mr. Musk knows exactly what he is getting into. After all, there are plenty of fledgling examples of 鈥渇ree speech鈥� focused platforms launched in the past few years as Twitter antidotes, largely by conservatives unhappy with the company鈥檚 crackdowns on hate, harassment, and misinformation. Many have struggled to deal with toxic content, and at least one has been cut off by its own technology providers in protest.

鈥淭his move just shows how effective [moderation features] have been to annoy those in power,鈥� said Kirsten Martin, a professor of technology ethics at the University of Notre Dame. 鈥淚 would be worried as to how this would change Twitter鈥檚 values.鈥�

The fact that no other bidders emerged in public before Mr. Musk鈥檚 deal was a sign that other would-be acquirers might find Twitter too difficult to improve, said Third Bridge analyst Scott Kessler.

鈥淭his platform is pretty much the same one we鈥檝e had over the last decade or so,鈥� Mr. Kessler said. 鈥淵ou鈥檝e had a lot of smart people trying to figure out what they should do, and they鈥檝e had trouble. It鈥檚 probably going to be tough to make a lot of headway.鈥�

Mr. Musk received some effusive, if highly abstract, praise from an unexpected quarter聽鈥� Twitter co-founder and former CEO Jack Dorsey, who praised Mr. Musk鈥檚 decision to take Twitter 鈥渂ack from Wall Street鈥� and tweeted that he trusts Mr. Musk鈥檚 mission to 鈥渆xtend the light of consciousness鈥� 鈥� a reference to Mr. Dorsey鈥檚 notion that 鈥淭witter is the closest thing we have to a global consciousness.鈥�

But others familiar with Twitter say they鈥檙e still dismayed at Mr. Musk鈥檚 successful bid for the company.

鈥淭witter is going to let a man-child essentially take over their platform,鈥� said Leslie Miley, a former Twitter employee who has also worked for Google and Apple. Mr. Miley, who was the only Black engineer at Twitter in a leadership position when he left the company in 2015, echoed doubts about Mr. Musk鈥檚 grasp of the platform鈥檚 complexities.

鈥淚 am not sure if Elon knows what he is getting,鈥� Mr. Miley said. 鈥淗e may just find that having Twitter is a lot different than wanting Twitter.鈥�

The more hands-off approach to content moderation that Mr. Musk envisions has many users concerned that the platform will become more of a haven for disinformation, hate speech, and bullying, something it has worked hard in recent years to mitigate. Wall Street analysts said if he goes too far, it could also alienate advertisers.

Shares of Twitter Inc. rose more than 5% Monday to $51.70 per share. On April 14, Mr. Musk announced an offer to buy Twitter for $54.20 per share. While the stock is up sharply since Mr. Musk made his offer, it is well below the high of $77 per share it reached in February 2021.

Mr. Musk has described himself as a 鈥渇ree-speech absolutist鈥� but is also known for blocking or disparaging other Twitter users who question or disagree with him.

In recent weeks, he has proposed relaxing Twitter content restrictions聽鈥� such as the rules that suspended former President Donald Trump鈥檚 account聽鈥� while ridding the platform of fake 鈥渟pambot鈥� accounts and shifting away from advertising as its primary revenue model. Mr. Musk believes he can increase revenue through subscriptions that give paying customers a better experience聽鈥� possibly even an ad-free version of Twitter.

Asked during a recent TED interview if there are any limits to his notion of 鈥渇ree speech,鈥� Mr. Musk said Twitter would abide by national laws that restrict speech around the world. Beyond that, he said, he鈥檇 be 鈥渧ery reluctant鈥� to delete posts or permanently ban users who violate the company鈥檚 rules.

It won鈥檛 be perfect, Mr. Musk added, 鈥渂ut I think we want it to really have the perception and reality that speech is as free as reasonably possible.鈥�

After the deal was announced, the NAACP released a statement urging Mr. Musk not to allow Mr. Trump, the 45th president, back onto the platform.

鈥淒o not allow 45 to return to the platform,鈥� the civil rights organization said in a statement. 鈥淒o not allow Twitter to become a petri dish for hate speech or falsehoods that subvert our democracy.鈥�

As both candidate and president, Mr. Trump made Twitter a powerful megaphone for speaking directly to the public, often using incendiary and divisive language on hot-button issues. He was permanently banned from the service in the aftermath of the Jan. 6 storming of the Capitol.

鈥淚f Musk either fires or drives away the team at Twitter that鈥檚 committed to keeping it clean and making it less hate-filled, he鈥檒l see an immediate drop in user activity,鈥� said Siva Vaidhyanathan, a media studies professor at the University of Virginia. 鈥淚 think he鈥檚 going to find pretty fast that inviting the bigots back in is bad for business.鈥�

In Europe, officials reminded Mr. Musk about a new law, the Digital Services Act, that will force tech companies to step up policing of their online platforms.

鈥淏e it cars or social media, any company operating in Europe needs to comply with our rules聽鈥� regardless of their shareholding,鈥� tweeted Thierry Breton, the European Union commissioner in charge of the bloc鈥檚 internal market. 鈥淢r. Musk knows this well. He is familiar with European rules on automotive, and will quickly adapt to the Digital Services Act.鈥�

Some users said Monday that they were planning to quit the platform if Mr. Musk took it over. To which he responded on Twitter: 鈥淚 hope that even my worst critics remain on Twitter, because that is what free speech means.鈥�

While Twitter鈥檚 user base of more than 200 million remains much smaller than those of rivals such as Facebook and TikTok, the service is popular with celebrities, world leaders, journalists, and intellectuals. Mr. Musk himself is a prolific tweeter with a following that rivals several pop stars in the ranks of the most popular accounts.

This story was reported by The Associated Press. Tom Krisher reported from Detroit. Matt O鈥橞rien reported from Providence, Rhode Island. AP Business Writers Marcy Gordon in Washington, Barbara Ortutay in Oakland, Calif., Kelvin Chan in London, and Sam Petrequin in Brussels contributed to this report.