SAN FRANCISCO -- Google has sprinkled some new ingredients into its search engine in an effort to prevent bogus information and offensive suggestions from souring its results.

The reflects Google's confidence in a new screening system designed to reduce the chances that its influential search engine will highlight untrue stories about people and events, a phenomenon commonly referred to as "fake news."

Although only a small fraction of Google's search results were being polluted with falsehoods, it was still happening frequently enough to threaten the integrity of a search engine that processes billions of requests a day, largely because it is widely regarded as the internet's most authoritative source of information.

Google also has reprogrammed a popular feature to omit derogatory suggestions from its automated recommendations of search requests.