Last year， Google implemented a new tool to fight the spread of misinformation on the web worldwide. The new “Fact Check” program automatically labels dubious stories in users’ search results， and provides links to fact-checking sites like Snopes and Politifact to establish the veracity of their claims.1
　　The new tool comes as major websites such as Google， Facebook， and Twitter continue to face pressure to check the spread of “fake news” across the internet， an issue which was catapulted2 into the spotlight during the US presidential campaign.
　　Over the past few years， sites such as Google have had to walk a fine line between policing false claims and supporting basic principles of free speech online. Google，after all， is the most popular search engine in the world， sporting more than 77 percent of the global search engine market share. And for many， that level of influence entails3 some responsibility to make sure its users are not misled.
　　“Building systems that help people get better at judging information is an important goal and helping people notice when information might not be credible is an excellent thing to do—in my work， I call this ‘designing for information assess ability，’”says Andrea Forte， an assistant professor at Drexel University’s College of Computing