https://phys.org/news/2018-11-social-media-misinformation-winners.html

Caught embarrassingly off-guard after they were played by Russian agents meddling with the 2016 U.S. elections, the technology giants have thrown millions of dollars, tens of thousands of people and what they say are their best technical efforts into fighting fake news, propaganda and hate that has proliferated on their digital platforms.

Facebook, in particular, has pulled a major reversal since late 2016, when CEO Mark Zuckerberg infamously dismissed the idea that fake news on his service could have swayed the election as "pretty crazy." In July, for instance, the company announced that heavy spending on security and content moderation, coupled with other business shifts, would hold down growth and profitability. Investors immediately panicked and knocked $119 billion off the company's market value.