For me personally it's a negative. Only last week I completely deleted my account, even that experience was all very "Black Mirror" for e.g. "Are you sure you want to leave, Abi (my wife) will really miss you"
I would find myself getting frustrated with the narcissism and vanity of my friends (the whole platform seems to encourage this so I don't blame them) and ultimately I asked myself, "why am I wasting my time on here?, go and do something creative". For the 1st couple of days I'd occasionally hit a space on my phone where the FB app used to be, a sign that this supposed "tool" was now part of my daily procrastinating routine. Going cold turkey was the best thing for me, no more mini dopamine hits from "likes", I have to earn that reaction from people in real life, which is far more gratifying.
I can now experience things without having to constantly feel the need to share, which ultimately feeds into the bragging culture of FB....Personally I was always self aware not to do this too much but I think back when people used to ask you about your experiences and you had a legitimate reason to tell them, now you're expected to just flaunt it without being asked.
I will say that I have found FB very useful for events (whether that's gigs, gatherings or people's birthday's I'd forgotten about) so I will miss that aspect of it but I'll just have to organise myself a little better to work around that, plus there's always whatsapp.
lmao!