Lyons said that she soon realized that many people were reporting posts as false simply because they did not agree with the content. Because Facebook forwards posts that are marked as false to third party fact-checkers, she said it was important to build systems to assess whether the posts were likely to be false in order to make efficient use of fact-checkers' time. That led her team to develop ways to assess whether the people who were flagging posts as false were themselves trustworthy.