Well yes and no. I assure you, many many forums exist outside of Facebook, and mailing lists too.
And endless, classic, non-https sites still exist too.
They are just pages deep in Google's search results, especially with the entire first several pages of scrolling being their almost always wrong suggestions.
And it doesn't help that verbatim is completely broken now, and that Google aliases search terms, and drops search terms, even when using quotes.
A horrible design, and the result is all that goodness is harder to find.
Now it's just silos controlled by megacorps, trying to outdo each other in competition for attention.