“So where they’ve really not done their homework and they’ve been negligent in the way they have spread this false information or disseminated it.”

“I think we need to look into whether there is a role (for criminal law) in relation to false health information.”

However, Prof Lewis said that criminalisation would be “difficult to justify” in cases where no malicious intent could be proved.

Prof. Lewis became one of the Law Commission’s five commissioners last month, and will lead its work drawing up reforms to modernise swathes of the UK's criminal law over her five-year term, starting a wide-ranging review of how Britain’s communications laws function in the social media age.

To date, over two thirds of the independent statutory body's recommendations for Government to amend or pass new legislation have been implemented wholly or in part.

As part of the review, Prof Lewis said the commission would be considering whether “glorification” of self-harm online should also be made a criminal offence.

The Law Commission is set to release its proposals on modernising communication laws for public consultation later this year. Prof. Lewis will then draw up recommendations, which will be signed off by four other law commissioners, before going to the Government.

The 52-year-old comes to the task with a wealth of experience dealing with contentious legal cases in three different countries, with most of her work to date focusing on historic child sex abuse prosecutions and the medical ethics around assisted dying.

Born and raised in Wembley, north London, Prof. Lewis moved to Canada aged 11 with her family before going on to study maths at the Massachusetts Institute of Technology (MIT).

It was an optional ‘introduction to the law’ module that ignited her interest in free speech issues and she then went on to study law as a post-grad in Canada. She later qualified as a barrister and clerked for Mr Justice Iacobucci on the Commonwealth country’s Supreme Court, before returning to the UK and taking a position at King's College London in 1995.

Prof. Lewis said her involvement with emotive issues such as euthanasia meant she keeps a low profile on social media herself, partly due to already receiving correspondence in her email inbox that she “doesn’t want to read”. However, she said she is also keenly aware of the way the disproportionate abuse women face online is hounding them off social media and silencing them.

She said: “If victims are effectively forced offline by the behaviour of potential defendants, then their freedom of expression is being limited in a way that we should worry about.”

One model the new law commissioner is looking at for modernising the UK’s laws is New Zealand’s approach of criminalising online messages based on the harm they cause, with harm largely defined as emotional distress.

She highlighted UK law around battery as a comparative model, whereby any unlawful physical contact is classed as assault but then penalties increase with the severity of actual or grievous bodily harm.

Yet she warned such a system for social media abuse would have to be linked to defined criminal actions so that lawful behavior was not inadvertently criminalised by accusations of harm or offence.

“I would slightly worry that [behaviour] that may not be illegal then becomes illegal because the victim was harmed,” said Prof. Lewis.