Google is using a 10,000-strong army of independent contractors to flag "offensive or upsetting" content, in order to ensure that queries like "did the Holocaust happen" don't push users to misinformation, propaganda and hate speech. From a report on The Guardian: The review of search terms is being done by the company's "quality raters", a little-known corps of worldwide contractors that Google uses to assess the quality of its systems. The raters are given searches based on real queries to conduct, and are asked to score the results on whether they meet the needs of users. These contractors, introduced to the company's review process in 2013, work from a huge manual describing every potential problem they could find with a given search query: whether or not it meets the user's expectations, whether the result offered is low or high quality, and whether it's spam, porn or illegal. In a new update to the rating system, rolled out on Tuesday, Google introduced another flag raters could use: the "upsetting-offensive" mark.