I'm always surprised that Reddit gets a free pass in these discussions. Reddit has been home to some of the most egregious bad communities and misinformation hives.
Their invisible-hand moderation system allows a small number of moderators to completely control the conversation in a subreddit. Banning dissenters and removing comments that don't agree with what the moderators want people to see is an easy way to make it look like everyone is in natural agreement on a topic.
The weirdest part is that most tech people readily admit that Reddit is full of terrible content, even on the front page. The common retort is that it's not so bad if you create an account and manually remove all of those bad subreddits from your list, but by the same argument Facebook isn't a problem because you can simply not subscribe to the bad content.