It’s not clear whether these attempts to tackle misinformation will work; critics have called them ineffective and slow. But there’s another problem, too. So far, Facebook and the public have focused almost solely on politics and Russian interference in the United States election. What they haven’t addressed is the vast amount of misinformation and unevidenced stories about reproductive rights, science and health.

Evidence-based, credible articles about abortion from reputable news outlets like The New York Times and The Washington Post didn’t make it to the top of the list of “most shared” articles on Facebook last year, according to BuzzSumo. But articles from the site LifeNews.com did.

LifeNews, which has just under one million followers on Facebook, is one of several large anti-abortion sites that can command hundreds of thousands of views on a single post. These sites produce vast amounts of misinformation; the Facebook page for the organization Live Action, for instance, has two million Facebook followers and posts videos claiming there’s a correlation between abortion and breast cancer. And their stories often generate more engagement than the content produced by mainstream news organizations, said Sharon Kann, the program director for abortion rights and reproductive health at Media Matters, a watchdog group. People on Facebook engage with anti-abortion content more than abortion-rights content at a “disproportionate rate,” she said, which, as a result of the company’s algorithms, means more people see it.

Facebook’s current initiatives to crack down on fake news can, theoretically, be applicable to misinformation on other issues. However, there are several human and technical barriers that prevent misinformation about reproductive rights from being identified, checked and removed at the same — already slow — rate as other misleading stories.

First, the question of what’s considered a “fake news” site is not always black and white. Facebook says it has been tackling the sources of fake news by eliminating the ability to “spoof” domains and by deleting Facebook pages linked to spam activity. For example, this year Facebook identified and deleted more than 30 pages owned by Macedonian publishers, who used them to push out fake stories about United States politics, after alarms had been sounded about sites in the country spreading misinformation about the 2016 campaign. (Facebook says some of the sites may have been taken down for other terms-of-service violations.) But anti-abortion sites are different. They do not mimic real publications, and they publish pieces on real events alongside factually incorrect or thinly sourced stories, which helps blur the line between what’s considered a news blog and “fake news.”