Social media giant Twitter has started testing the 'co-author' tweet feature, just as Instagram rolled out in 2021 on its platform. As per TechCrunch, Twitter has confirmed it's "exploring" a new feature that would allow two accounts to co-author a single tweet. App researcher Alessandro Paluzzi has been posting evidence of the feature's development since at least December. This feature becomes useful when two accounts want to have their names attached to a single post, ranging from brand partnerships to influencer campaigns.