Meta is set to release a "Twitter killer" app called Threads. Here's what to know.

Meta is set to release a rival to Twitter on Thursday, a social media app called Threads. The service is described by Meta as "Instagram's text-based conversation app."

The new service, which is available for pre-order in Apple's App Store and will be released on July 6, has a similar appearance to Twitter, with screenshots of the service showing messages with replies from other users. One screenshot of the app indicates that Instagram users will be able to immediately click to follow the same accounts on Threads, which could help users quickly build large follower bases. 

Threads will arrive at a critical moment for Twitter, whose owner Elon Musk has been making changes to the social network that have driven away advertisers and alienated some users. Musk's recent decision to throttle usage for some nonpaying members, limiting free accounts to reading 600 tweets per day, sparked intense backlash.