Meta's new app Threads, the social media giant's alternative for Twitter, has attracted about 70 million users since its debut Wednesday night, CEO Mark Zuckerberg said on Friday. 'Data harvesting'As Twitter faces turbulence from controversial policy changes, Threads appears to have emerged at just the right time. Other caveatsFor now, only Instagram users can create a Threads account. Another wrinkle is you can't delete a Threads account without also deleting your Instagram. If users object to the two-for-one dynamic, some tech company websites recommend creating a separate Instagram account for Threads that can be easily given up.