I have been involved in these boards since the early 90's with USENET and then mailing lists. I was even owner of Weights - 2 and a Nutrition list that I can't remember the name. These two were very big then but there was also not much available at the time. With the invention of the forum type boards, things really took off and the mailing lists died off. I think the market got saturated and people started using other methods to communicate. Somehow I got REDDIT stuff sent to me but I have never posted and honestly know nothing about it. While I have seen so many boards come and go but there are still a very few that are active.
I think BB and PL is giving way to general fitness and diet. IMO The rate that guys approaching middle age dropping out is greater than the rate of new guys coming in.
This maybe just the views of an older guy but the younger men doesn't care how they look with their shirt off or how the young woman look in a bikini. It's not like it use to be. When I, at 53 y.o. go to the beach and look better than most 20 something, there's a fuukin problem.
Don't believe me, ask Bundy how loaded the NJ beaches were with quality tail years back. Now I can't even bring a hoagie to the beach for fear of regurgitating it.