X Corp. v. Operation Bluebird

X Corp. v. Operation Bluebird is a legal dispute in the United States concerning the ownership and continued validity of the Twitter trademark following the rebranding of the social media platform Twitter to X in 2023. The case involves X Corp., the company that owns and operates the platform X, formerly known as "Twitter", and Operation Bluebird, a startup seeking to launch a new social media service using the name "Twitter".

The dispute centers on whether the "Twitter" trademark was effectively abandoned after the rebranding, and whether another company may legally register or use the name.