Sexual Assault Allegations
Everything mentioned has some merit, but I think you are missing the elephant in the room.
Facebook started the same year as bogley in 2004. It started getting traction in 2008-2009 and has continued to grow, reaching critical mass. MANY members have met people with similar outdoor interests on bogley and then connected on Facebook, well the rest is history. Oh yeah and the second largest social network (photo site), Instagram, owned by Facebook.
You can see the stats and read about the history here. Facebook is the largest social network in the world. Did it affect forums and other community sites? Well duh, absolutely. Do I think bogley has its place? Absolutely.
Facebook Stats:
1.37 billion daily active users on average for September 2017
2.07 billion monthly active users as of September 30, 2017
https://newsroom.fb.com/company-info/