"Legal proceedings are being taken by a professional footballer against Twitter for allegedly publishing information covered by a super-injunction.
The player, identified only by the initials CTB, is also known to be taking action against the Sun newspaper and ex-Big Brother star Imogen Thomas.
Papers lodged in the High Court are against Twitter and "persons unknown".
They request disclosure of Twitter users said to be behind the publication of confidential information.
The order requires Twitter to disclose the requested information within seven days - or within the appropriate time required by the law in
Lawyers at Schillings who represent CTB have issued a statement clarifying the action it has taken.
It said it was not suing Twitter but had made an application "to obtain limited information concerning the unlawful use of Twitter by a small number of individuals who may have breached a court order".
Twitter has refused to comment on the matter.
There are precedents for legal action to find out the names of individuals behind some Twitter accounts.
Two weeks ago, one Twitter follower made a concerted attempt to challenge the law by pulling together, in a short burst of tweets, the names of celebrities thought to have taken out gagging orders.
Jemima Khan poured petrol on the flames by tweeting a denial, giving broadcasters and newspapers a legitimate peg to run the story.
Websites such as Twitter have put a huge strain on the ability of the courts to enforce gagging orders and it has been widely assumed there is no legal redress against them.
The Culture Secretary Jeremy Hunt said this week that digital media had made an ass of the law and it was hard to enforce injunctions against Twitter because it was incorporated in the
Now it seems the law is about to be tested.
Twitter has been resisting attempts by the
Media lawyer Nick Lockett said the legal action against Twitter may not have much effect.
"What will have to be established is that Twitter was subject to the jurisdiction of the court," he said. While
In the case of the