I no longer use facebook. Like you, I never thought much of it. (Apart from starring at girl's pictures and playing pranks). The only time I use facebook is when I'm applying for an airdrop and some of the tasks involve sharing stuff on facebook.
I don't think facebook is totally dead though. It's like a wounded samurai warrior, clutching to his last grasps of air. I guess it's the reason why facebook is acquiring other social media platforms, trying to channel some of their relevance into facebook.
For me, it's a dumping ground. And maybe for others too
I think facebook mainly acquired those others because it knows that it is time to move on eventually.