[truly]

The interesting content is still there, but it is hidden under SEOed content. It is simply not as popular in relative terms.

Most of the popular content you see on FB or other aggregators are simply "preview"s to get your money. A "thoughtful" article that just mentions half-way through a book you should buy. A blogpost on some technical matter that just mentions they are looking for new hires. A funny video to get you to see ads. And so on, and so forth.

It is still possible to find interesting communities, like HN, but you should probably dig around the niche that you enjoy. Discord has some good servers. IRC is still around. It all depends on what you are interested in.