Professor Philip N. Howard of the University of Oxford found that about one half of all news on Twitter directed at Michigan prior to the election was junk or fake. The other half came from real news sources. Criticized for failing to stop fake news from spreading on its platform during the 2016 election, Facebook thought that the problem could be solved by engineering, until May 2017 when it announced plans to hire 3,000 content reviewers.[47] Fraudulent stories during the 2016 U.S. presidential election popularized on Facebook included a viral post that Pope Francis and actor Denzel Washington had endorsed Donald Trump.[48][49] Alternet reported that Trump himself had been the source of some of the related misinformation.[50]