England’s High Court has used Twitter to issue a writ to an anonymous user of Twitter, in what is believed to be a world first.

The court said the tweet was the best way to reach the owner of @Blaney’sBlarney, after ruling that the unknown account holder was impersonating law firm owner Donal Blaney, who has a blog in the same name.

The tweet told the account holder to stop posting under the account, remove past posts and identify himself to the court.

“I think this is a landmark decision to issue a writ via Twitter,” UK law lecturer Konstantinos Komaitis told The Telegraph. “You are creating a precedent that people will be able to refer to. It only takes one litigant to open the path for others to follow.”