I feel you, I still briefly log-in to post blog posts + music that I work on, and a significant majority of my professional network came from a select few Faceb

I feel you, I still briefly log-in to post blog posts + music that I work on, and a significant majority of my professional network came from a select few Facebook communities that I was heavily involved in a few years ago. So yeah I think you're spot on with the "active engagement" bit, a lot of value can be generated when it's used in that sense.