Online news stories show an upward trend in false or biased content as well as greater ideological polarization. That is the conclusion of a study that analyzed more than six million web addresses shared on Facebook during a four-year period. The researchers suggest some changes in Facebook could have encouraged lower quality content, along with variations in the way users engage with media content. Another way of defining what the researchers called greater ideological polarization is an upward trend in more extreme ideological content. The data from users in the United States was analyzed by researchers in Barcelona, Spain and published in the journal EPJ Data Science.