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It is thought nearly 3 million people died at Auschwitz

The number of hate and terrorist websites has increased by a third in the past year, according to the Simon Wiesenthal Center.

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.

Holocaust denial is a perfect example of how a hateful idea was incubated on the internet.

Holocaust denial is hate speech. It is an attempt by anti-Semites to make Jews appear to be liars and manipulators