Twitter is testing a Co-Tweet feature, as per mobile developer Alessandro Paluzzi and social media consultant Matt Navarra.

The two posted a test tweet, where both their usernames are displayed and clickable above the written content.

Paluzzi has been tweeted about the development of the collaborative feature since December 2021, showing followers the evolution of the tool. He said it is not officially available just yet, as reported by Mashable.

According to the tweets, users can send an invite to “co-tweet,” which the invitee can subsequently accept or decline.

Essentially, a user can’t just add another person to a tweet without permission. If accepted, the written tweet will show on both users’ timelines.

These invites show up in the notifications tab or DMs. Navarra posted a screenshot that shows a pop-up message from Twitter, displaying the CoTweet request and also adding the stipulation that “you can remove yourself anytime” from the tweet.