The key difference between Forums and "Social Media" is that Forums last forever(I hope), whereas FB etc., is ephemeral. It is nearly impossible to search social media for past wisdom, whereas, a Google search will always return links to Forums regarding your search arguments. How many times have you searched for an answer on "how to fix this" on a car or "accuracy issues" to see that the answers are frequently forum based, or You tube, which is searchable?