https://www.theguardian.com/technology/2023/jul/06/twitter-meta-lawsuit-threads-app-musk-zuckerberg

In a letter to CEO Mark Zuckerberg, a lawyer for the Elon Musk-owned app said Meta had unlawfully misappropriated trade secrets

Twitter has threatened to sue Meta over its new Threads app, which Mark Zuckerberg has openly billed as a rival, claiming the company has violated Twitter’s “intellectual property rights”.