Can someone explain to this fossil what Facebook actually achieves?

I see that people "Follow" others.
Mostly they follow Celebrities and whoevers.
Why do people follow Celebrities?
If a Celebrity has 1 million "Friends" what does the follower get out of it?
It is not as if the Celeb knows his followers. It is not as if the Celeb messages his followers as a Friend would do.
I see people sitting in Cafes continually scrolling through endless posts achieving what?
Keeping up with the Kardashians?🤷‍♂️

SW-User

FB is only useful if you're trying to promote yourself or stay in touch with family and friends. Otherwise, it's a huge waste of time. People follow celebrities because they are obsessed with them.