Elon Musk threatens lawsuit as Twitter rival Threads takes off

Twitter threatened to sue Meta just hours after the Instagram parent company launched Threads, an app it hopes will beat out the struggling site owned by Elon Musk.

In a letter to Meta CEO Mark Zuckerberg, published by online news outlet Semafor on Thursday, Musk lawyer Alex Spiro accused the company of "unlawful misappropriation of Twitter's trade secrets and other intellectual property."

The letter accused Meta of hiring dozens of former Twitter employees who "had and continue to have access to Twitter's trade secrets and other highly confidential information."

Threads is the biggest challenger yet to Musk-owned Twitter, which has seen a series of potential competitors emerge but not yet replace one of the world's biggest social media platforms, despite its struggles.

Zuckerberg's latest move against Musk further heightened the rivalry between the two multibillionaires who have even agreed to meet for hand to hand combat in a cage match.

Threads went live on Apple and Android app stores in 100 countries at 2300 GMT on Wednesday, and early feedback noted its close, but scaled back, resemblance to Twitter.

Within a few hours, more than 30 million people had downloaded Threads, Zuckerberg said Thursday.

"Feels like the beginning of something special, but we've got a lot of work ahead to build the app," Zuckerberg wrote on his official Threads account.

Accounts were already active for celebrities such as Jennifer Lopez, Shakira, Oprah Winfrey and Hugh Jackman, as well as media outlets including The Washington Post and The Economist.

Zuckerberg wrote: "It'll take some time, but I think there should be a public conversations app with 1 billion+ people on it."

"Twitter has had the opportunity to do this but hasn't nailed it. Hopefully we will."

Twitter has said it has more than 200 million daily users.

Musk meanwhile retweeted an image that said the Threads logo resembled a tapeworm. "Metaphorically too," he added.

In another post referencing Twitter's potential legal action against Meta, Musk noted that "competition is fine, cheating is not."

Meta spokesman Andy Stone said on Threads: "No one on the Threads engineering team is a former Twitter employee -- that's just not a thing."

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Threads was introduced as a spin-off of Instagram, giving it a built-in audience of more than two billion users and sparing the new platform the challenge of starting from scratch.

Instagram chief Adam Mosseri told users that Threads was intended to build "an open and friendly platform for conversations."

"The best thing you can do if you want that too is be kind," he said.

Zuckerberg is taking advantage of Musk's chaotic ownership of Twitter to push out the new product, which Meta hopes will become the go-to platform for celebrities, companies and politicians.

Analyst Jasmine Engberg from Insider Intelligence said Threads only needs one out of four Instagram monthly users "to make it as big as Twitter."

"Twitter users are desperate for an alternative, and Musk has given Zuckerberg an opening," she added.

Under Musk, Twitter has seen content moderation reduced to a minimum with glitches and rash decisions scaring away celebrities and major advertisers.