Threads, the new “Twitter Killer” app from Meta that was launched on Thursday, now has 50 million users — just over 24 hours since the app was rolled out. The text-based microblogging service is closely tied to Meta’s popular photo and video sharing service, Instagram. While the brisk rise of Threads is impressive, it is worth noting that Meta is using its user base of over 2.35 billion active users on Instagram to get users to sign up for…