Twitter threatens legal action over Threads app 😂 https://www.bbc.com/news/world-us-canada-66129215 More than 55 million people have signed up for the new app, according to Meta. Twitter lost a large proportion of its 7,500 employees, as high as 80%, in waves of redundancies following Mr Musk's takeover last October. Some of them joined Meta to build this new app.