More than 35 million people on social media networks including Twitter and Facebook will be reached through a major social media campaign fronted by Gemma Dowler to put an end to press abuse.At 20:00 BST on 27 June 2014, victims of press abuse will join forces with leading figures on Twitter and thousand of members of the public to simultaneously tweet – flash-mob style – a powerful message demanding the implementation of the Leveson Inquiry’s recommendations on press self-regulation.The ‘Leveson Now’ campaign – co-ordinated by campaign group Hacked Off in the wake of the phone hacking trial – is Britain’s biggest ever Thunderclap, with 2,500 people on Twitter and facebook messaging their combined audience of more than 35 million followers and friends.Supporting Gemma Dowler, the sister of Milly, the Thunderclap will reach the 35 million followers of some of Britain’s most popular Twitter users, including Russell Brand, Stephen Fry, Simon Pegg, JK Rowling, John Cleese, John Bishop, Ian McKellen, Richard Dawkins, Graham Norton, Paloma Faith, Marcus Brigstocke, Billy Bragg, Irvine Welsh, Peter Tatchell, Guy Chambers and many, many others.The Thunderclap follows the short video made by Gemma Dowler in response to the phone hacking trial verdicts. Gemma made a heartfelt plea to David Cameron to keep the promise he made to her family – to bring about real and permanent change to ensure that no other family has to suffer the press abuse that her family endured.Dr Evan Harris, Associate Director of Hacked Off, confirmed:

“The response has been huge. 18 months after the fastest-growing petition ever endorsed the Leveson Report, Thunderclap have confirmed we now have their largest ever social media campaign in the UK.

"This reinforces what opinion polls have shown – that the public remain committed to seeing Lord Justice Leveson’s recommendations implemented, back the Royal Charter and will never trust anything that falls short of that.”

Twitter and facebook users can sign up for the Thunderclap here:It will encourage people to share this message:HackingTrial shows it’s time for *real* change http://bit.ly/twgd14 Plse RT & sign the declaration at #LevesonNow http://thndr.it/1lxcDtpThe Leveson Royal Charter DeclarationAn unprecedented coalition of more than 200 leading figures have joined with victims of past press abuse in adding their names to a Declaration in support of the Royal Charter on press self-regulation. Danny Boyle, JK Rowling, Michael Palin, Sir Tom Stoppard, Nick Davies, Sir David Attenborough, Michael Frayn, Alan Bennett, Philip Pullman, Sam Mendes, Sir Alan Ayckbourn, Irvine Welsh, Bob Geldof, Emma Thompson, Ian McEwan, Helen Fielding, John Cleese, V.S. Naipaul, Sir Ranulph Fiennes, AS Byatt, Rowan Williams and Prof Richard Dawkins are amongst hundreds of leading cultural figures calling for British newspapers to accept the Royal Charter.The Declaration states:“We believe that a free press is a cornerstone of democracy. It should be fearless in exposing corruption, holding the powerful to account and championing the powerless. It has nothing to lose, and can only be enhanced, by acknowledging unethical practice in its midst and acting firmly to ensure it is not repeated.“We also believe that editors and journalists will rise in public esteem when they accept a form of self-regulation that is independently audited on the lines recommended by Lord Justice Leveson and laid down in the Royal Charter of 30 October 2013.“It is our view that this Charter safeguards the press from political interference while also giving vital protection to the vulnerable. That is why we support it and that is why we urge newspaper publishers to embrace it.”