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The Los Angeles-based Jewish human rights organisation put the figure at more than 8,000 in its 2008 report Hate 2.0. It said the presence of such sites "demeans and threatens African Americans, Jews, immigrants, gays and virtually every religious denomination".
And the number of so-called hate sites is growing fast, while the use of social networks to push controversial messages is also on the rise.
In May this year, Facebook became embroiled in a row after a number of Holocaust denial groups were set up on the site.
Critics said Facebook was propagating anti-Semitism, others said that free speech was a cornerstone of society and Facebook should keep its hands off.
At the time, Barry Schnitt, a spokesman for Facebook, said it should be "a place where controversial ideas can be discussed".
"The bottom line is that, of course, we abhor Nazi ideals and find Holocaust denial repulsive and ignorant," he said.
"However, we believe people have a right to discuss these ideas."
A few days later, the site had closed two of the groups, Holocaust is a Holohoax and Based on the facts... there was no Holocaust. It said they had breached the firm's terms of service.
But there are still plenty of other Holocaust denial groups on Facebook: Holocaust is a Myth, 6,000,000 for the TRUTH about the Holocaust, The problem of forged Holocaust photos, and Holocaust Deniers, to name just four.