In the study "Intramedium Interaction and the Third-Person Effect: How Partisans Respond to Youtube Ads and Comments," the researchers explain that the third-person effect entails the fact that when people see a negative news story or video about something they believe in, they tend to push it off and say that the source is unreliable or the information is untrue. People more easily believe information that supports their points of view.
For example, comments on a video about Donald trump attacking Ben Carson's beliefs revealed that people who side with Ben Carson say the video is false, whereas people who side with Trump say the video is completely valid. Someone who sides with Carson commented, "Wow, the heavy stupidity here alarmed me at first, then I notice it was FOX." However, another commenter said, "Faith has no place in politics," which is what Trump had been discussing in the video.