Like the old chat rooms. When the internet exploded that was the thing. I got into some for about a year or so. Sports ones. Spent maybe an hour or so in the evenings after I got everything else done I needed to do. I know some people spent all their free time in them, or as soon as they got home, they went right to the chat rooms.
They ran their course, and I am not even sure if they are a thing now. I have not been in one since 1999.
I guess there are so many other options now, the younger persons have all of that to use. Like you mentioned, social media.
Also many fans are into fantasy football, they really don't follow teams like they used to, or they jump from team to team because of it. That is just a guess, but I think a pretty good guess.
They eventually settle on one team more so than others.