Google says it is "thinking deeply" about ways to improve search, after criticism over how some results -- including ones discussing the Holocaust -- were ranked. From a report on BBC: Searching for "did the Holocaust happen?" returned a top result that claimed it did not, as Guardian journalist Carole Cadwalladr reported. Now, the ranking has changed for US users. The page -- from white supremacist site Stormfront -- remains top in the UK. "This is a really challenging problem, and something we're thinking deeply about in terms of how we can do a better job," said a Google spokesman. "Search is a reflection of the content that exists on the web. The fact that hate sites may appear in search results in no way means that Google endorses these views."