Threads, Instagram’s ‘Twitter Killer,’ Has Arrived

After months of speculation and secrecy, Mark Zuckerberg’s long-rumored competitor app to Twitter is here.

The new app, Threads, was unveiled on Wednesday as a companion to Instagram, the popular photo-sharing network that Mr. Zuckerberg’s company, Meta, bought more than a decade ago. If Instagram executives get their way, Threads will also replace rival Twitter, with some techies referring to it as a “Twitter killer.”

The rollout of…