I have a Facebook page, tbh I think for the most part it sucks, as people have stated I really don't need to know about every minute of your day and generally I use the updates to post random shit or piss takes that just pop into my melon.
The only real use is its easy to just organise things with multiple people and if it wasn't for Facebook I wouldn't have got reunited with a couple of old school friends even tho we have lived in a five mile radius of each other for 20 years.
The other main reason for Facebook is I use it to store photos quickly from my phone, there's nowt important just random shots from my travels.
So generally speaking I'm on the fence, I wouldn't lose any sleep over it if it suddenly disappeared, but I know some addicts would be devastated.
Now twitter I don't mind for a whole different reason