(Paris) The Threads application, created by Meta to compete with Twitter, crossed the 100 million user mark on Monday, less than a week after its launch, according to the Quiver Quantitative site.

Meta, the parent company of Facebook and Instagram, launched this “microblogging” application last Wednesday, the first major threat to the weakened Twitter platform since its takeover last year by billionaire Elon Musk.

Earlier this year, the artificial intelligence application ChatGPT, created by OpenAI, took two months to reach this threshold of active users.

The number of Threads users is still far from that of Twitter, which has more than 350 million users. But Meta’s app can rely on synergies with popular image-sharing app Instagram, which has some 2 billion active users.

Threads thus allows Instagram users to be authenticated with their existing credentials to post content on the new platform.

It has not yet been launched in the European Union, where this practice appears to be prohibited by the Digital Markets Regulation (DMA), new legislation that will apply to digital giants from March 2024, according to experts.

Elon Musk also decided to fight back, sending through the lawyer for Twitter’s parent company, X Corp, a letter accusing Meta of breaching trade secrets and intellectual property rights. .

Facebook’s parent company is notably accused of having recruited “dozens” of former Twitter employees, according to the document published by the Semafor news site.

Giving Meta formal notice to cease its actions, X Corp said it was ready to take legal action if not.

“Competition is not a problem. Cheating is one,” Elon Musk tweeted.