Money on it that there's more Facebook users here than either of those platforms. I'm not one.
I'm sticking with Twitter, I don't follow a large number, for the time being as I haven't noticed any significant exodus amongst those I follow. Though I think there may well be a tipping point in the not too distant future.
Jazz Instagram is fun but sometimes can feel a bit like a manhood comparison site when it comes to pressings. Largely enjoyable space nonetheless and valuable for following record shops, discovered some nice stuff.