To turn on sharing to the fediverse, go in your Account Settings, faucet on Fediverse sharing (Beta) and Adhere to the Guidance. Sharing to the fediverse is out there to Threads end users ages 18 and up with public profiles. Meta by itself contains a fickle record with open protocols. https://econopass.com/news/world/is-the-fediverse-a-threat-to-centralized-social-media-platforms/