Actress Emma Watson has refused to be silenced by online trolls threatening to leak nude photos of her following her powerful speech on gender equality at the UN last week.

Watson’s plea for men to join the fight for equal rights for women has sparked a flood of pledges across the world, including from fellow celebrities and politicians.

"I hope we can all finally change laws and mentalities in order to establish what is nothing more than common sense," Watson posted on her Twitter account on Tuesday.

Watson, 24, who rose to fame as Hermione in the Harry Potter movies, gave her first major speech as a United Nations Women's Goodwill Ambassador in New York on Saturday, launching the "HeForShe" campaign to unite men and women for gender equality.

The initiative urges men to join the fight against violence and discrimination of women within days more than 70,000 men and boys had signed online pledges, according to the HeForShe online active map on the campaign's website.

The target is to mobilise one billion men and boys over 12 months with an online map showing exactly where men sign up.

However, Watson’s speech appears to have angered trolls on 4chan's b board who are now seeking retribution in the form of a smear campaign.

Setting up a countdown website that they have called EmmaYouAreNext, forum members have threatened to release nude photos of Watson.

They are also attempting to get #RIPEmmaWatson trending on Twitter and are posting photoshopped pictures of news sites suggesting that Watson has died.

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