"social media hurts democracy"
The arab spring (supported and brought to a tipping point by messages spread on social media) was not only possible in northern africa or in some arab countries (Libya, Egypt, Syria,...) Social media has introduced a new dimension into our western societies. Political will was for decades built by discussion in small groups but more importantly by a small group of media (newspapers, magazines, tv channels). These news channels had some commonly shared values, operated within those values.
Now we have "news" spreading publicly on Twitter, on Facebook or in closed groups of Facebook or other social media. And these "news" are not fact-checked by any authority anymore.
If I was a rogue actor I would weep for joy because of the possibilities that social media created to manipulate the masses.
So yes, I strongly believe that social media is hurting our democracies massively. And Facebook has a major role in this.