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Twitter threatened legal action against Meta shortly after Instagram launched Thread.
Threads, an app aimed at surpassing Elon Musk's struggling Twitter is a public conversation app.
Alex Spiro, a lawyer representing Musk, sent a letter to Meta CEO Mark Zuckerberg, accusing the company of unlawfully misappropriating Twitter's trade secrets and intellectual property.
The letter alleged that Meta had hired numerous former Twitter employees who had access to the company's confidential information.
Threads pose the most significant challenge to Musk's Twitter so far, as previous competitors have failed to replace one of the world's largest social media platforms, despite its difficulties.
This latest development further escalates the rivalry between Zuckerberg and Musk, two multibillionaires who have even agreed to a cage match.
In a surprising move, Zuckerberg tweeted for the first time in over a decade, sharing a Spiderman meme that seemingly draws attention to the similarities between Threads and Twitter.
Threads became available on the Apple and Android app stores in 100 countries at 12:00 WAT midnight on Thursday.
Initial feedback noted the shared resemblance between Thread and Twitter, albeit with some scaled-back features.
Within a few hours, Threads garnered over 30 million downloads, according to Zuckerberg's statement on Thursday.
Zuckerberg expressed his enthusiasm for the app's potential but acknowledged the need for extensive work to further develop it.
