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.
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