instagram may implement a way to share comments on other instagram posts in Threads, according to Alessandro Paluzzi, who often reverse engineers Meta's social media apps to find future features.
Paluzzi shared an image showing that when commenting on an instagram post, there could be a new drop-down menu that allows users to choose to share the comment only on instagram or “also share on Threads.”
Meta has made some tweaks to integrate Threads with its other platforms in the past, such as not showing Threads posts on instagram or facebook (and, later, allowing users to opt out of that). The twitter-like short-posting social network also doesn’t have direct messages of its own, but users can still receive or send messages through instagram.
The biggest effort, of course, is Meta's slow work to integrate Threads with the fediverse. The company's steps to achieve this include being able to see fediverse responses in their posts and, more recently, in the posts of others.