Mark Zuckerberg, CEO of Meta Platforms, posted his first tweet in over a decade, taking a jibe at Elon Musk on the day Meta's Instagram launched Threads. The photo showed two identical Spider-Men facing each other. The launch of Threads came as a threat to Twitter, which Musk owns.Mark Zuckerberg, CEO of Meta Platforms, posted his first tweet in over a decade, taking a jibe at Elon Musk on the day Meta's Instagram launched Threads. The photo showed two identical Spider-Men facing each other. The launch of Threads came as a threat to Twitter, which Musk owns.