Mark Zuckerberg is having a great week. The Meta chief said yesterday that Threads, the company’s rival to Twitter, hit 100 million sign-ups within five days of launch, dethroning ChatGPT as the fastest-growing online platform to reach that milestone. The big question now is: will they stay? Very early analysis suggests that some users are switching away from Twitter, rather than using the two sites in tandem. In the first two days that Threads was fully available, Twitter’s web traffic was down 5 per cent compared to the same two days the previous week and down 11 per cent year on year, the WSJ reports, while Matthew Prince, head of internet infrastructure firm Cloudflare, said Twitter’s traffic was “tanking”. Linda Yaccarino, Twitter’s CEO, hit back that the platform had its “largest usage day” since February last week, but without specifying which day. “There’s only ONE Twitter,” she tweeted. We’ll see.