Twitter Threatens Legal Action Against Meta Over Rival Threads App

This combination of file photographs created on June 22, 2023, shows SpaceX, Twitter, and electric car maker Tesla CEO Elon Musk during his visit at the Vivatech technology startups and innovation fair at the Porte de Versailles exhibition center in Paris on June 16, 2023 (R), and Facebook founder Mark Zuckerberg testifying before the House Financial Services Committee in the Rayburn House Office Building in Washington on Oct. 23, 2019 (L). Mandel Ngan, Alain Jocard/AFP via Getty Images

Lawyers for Elon Musk have threatened to take legal action against Meta Platforms after the Mark Zuckerberg-owned company this week unveiled a microblogging platform rivaling Twitter called Threads.

In a July 5 letter (pdf) addressed to Mr. Zuckerberg, Mr. Musk’s attorney Alex Spiro wrote that Twitter has “serious concerns” that Meta has engaged in “systematic, willful, and unlawful misappropriation of Twitter’s trade secrets and other intellectual property.”