[bbc] The jury system may not survive if it is undermined by social networking sites, England's top judge has said.
In a lecture published on Friday the Lord Chief Justice, Lord Judge, raised major concerns about the use of the internet by jurors.
He said: "If the jury system is to survive as the system for a fair trial... the misuse of the internet by jurors must stop."
Lord Judge said some jurors had used the internet to research a rape case.
Earlier this year a judge in Manchester had to dismiss a jury and restart a trial, The Sun reported, after a juror went onto her Facebook page, gave details of a trial and asked friends: "Did he do it?"
Lord Judge, who is the most senior judge in England and Wales, said it was too easy for campaigners to bombard Twitter with messages in a bid to put pressure on jurors who might be looking at it.
Top judge says internet 'could kill jury system'