Meta CEO Mark Zuckerberg appeared to make fun of Elon Musk for the second time this week. He responded to Threads posts with one word – "concerning" – in the same way Musk often tweets. Mark Zuckerberg appeared to take another jab at Elon Musk on Threads, his new Twitter rival. The Twitter owner has responded to tweets with "concerning" at least 26 times, Insider found after reviewing his past replies. A few hours after the rollout of Threads, Zuckerberg appeared to mock Musk when he tweeted for the first time in a decade and posted a Spider-Man meme.

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Persons: Mark Zuckerberg, Elon Musk, Zuckerberg, Elon, Nikita Bier, Philip Fung, Musk Organizations: Morning, Twitter, Meta