Developed by researchers at the University of Michigan in the US, the tool uses a Platform Health Metric called the Iffy Quotient, which draws data from two external entities: NewsWhip and Media Bias/Fact Checker. NewsWhip, a social media engagement tracking firm, collects URLs on hundreds of thousands of sites every day and then gathers information on which of those sites have engagements on Facebook and Twitter. Iffy Quotient queries NewsWhip for the top 5,000 most popular URLs on the two social media platforms. Then the tool checks to see if those domain names have been flagged by Media Bias/Fact Check, an independent site that classifies various sources based on their reliability and bias. The first report issued by the researchers confirms what was suspected about the 2016 US presidential election: the Iffy Quotient increased dramatically on both Facebook and Twitter during the election.