Social media is largely failing in fostering rational public discourse. This is a result of their design. But we do have much better mediums to deliberate collectively. You can learn about them in the Democracy Innovators Podcast:
youtube.com/watch?v=ZZxc...
youtube.com
Marcin Woźniak about Swarmcheck and Argument Mapping: How democratic discourse can be more rational
YouTube video by Democracy Innovators Podcast