institutionalized bigotries

This would be an example of institutional antisemitism. Facebook isn't staffed by Holocaust deniers, certainly, but their responses to Denial go beyond inadequate.

Btw, I checked Newsvine. They seem to have instituted a policy that to accuse anyone of being antisemitic or Islamophobic is against their terms of service. As for actual antisemitism or Islamophobia, I'm sure it's still allowed.

Why so many anti-Israel resolutions in the UN

A good part of the answer is institutional bias in the UN itself. Recently, it's come out that one of the most anti-Israel officials at the UN, Jean Ziegler, has praised the Holocaust Denier Roger Gaurady. (For his Holocaust Denial, not his saxophone playing.)

In 1996, Mr. Ziegler publicly defended Roger Garaudy, a French Stalinist whose book The Founding Myths of Modern Israel denies the Holocaust. “All your work as a writer and philosopher,” Mr. Ziegler wrote on April 1, 1996, “attests to the rigor of your analysis and the unwavering honesty of your intentions. It makes you one of the leading thinkers of our time.”

If Zeigler believes Gaurady's analyses is rigorous, it seems to me he is a Holocaust Denier, clearly biased and unfit for position related to Israel as well as morally compromised and unfit for any position at the UN. Yet when UN Watch asked the Swiss to withdraw his nomination to the UN Human Rights Council Advisory Committee, Switzerland declined.

As Deborah Lipstadt says:

This is really an outrage... Though UN critics are probably shrugging their shoulders and saying: "So what else is new?"

Holocaust Denial up worldwide in 2007

It's not clear to me that it was significantly up over 2005, but there's more:

The annual report, "Holocaust Denial: A Global Survey - 2007," published by the Washington-based David S. Wyman Institute for Holocaust Studies, found that Holocaust-denial activity was up worldwide, following a drop in 2006 due to the imprisonment in Austria of leading denier David Irving.

Curious that the arrest and release of a single individual would lead to noticable changes in Holocaust denial worldwide. Via Deborah Lipstadt.