The High Court has given permission for an injunction to be served via social-networking site Twitter.
The order is to be served against an unknown Twitter user who anonymously posts to the site using the same name as a right-wing political blogger.
The order demands the anonymous twitter user reveal their identity and stop posing as Donal Blaney, who blogs at a site called Blaney's Blarney.
The order says the twitter user is breaching the copyright of Mr Blaney.
He told BBC News that the content being posted to Twitter in his name was "mildly objectionable".
Mr Blaney turned to Twitter to serve the injunction rather than go through the potentially lengthy process of contacting Twitter headquarters in California and asking it to deal with the matter.
UK law states that an injunction does not have to be served in person and can be delivered by several different means including fax or e-mail.
