I guess my impressions are much the same as most here. FB was useful in the past, but the new algorithms have turned it into an cesspool of pointless spam where useful information simply gets lost/ is missed. From the perspective of what I do with Noise Receptor, I used to get a decent amount of traction with posting new reviews on FB, but virtually to the hour after the new algorithms kicked in, the traffic was down to a couple of likes and comments at most. Not that I am chasing likes or anything like that, it is just telling that stuff this forum is interested in is getting burried in favour of commercially promoted/ paid posts.
So, really this forum is my go to hub for new info etc, and then just the usual labels and associated contacts/ networks I have always dealt with.
I do however get a sense of fracturing of focus within the underground and the emergence of localised micro scenes which dont seem to spread much wider then the few involved in it. Chris Groves talked a bit on this in the editorial of his last Night Science issue. But even if that is happening, I have been following this stuff for coming up to 25 years now, so whatever is really important out there I will hear about at one point or another - even if there is a year delay or whatever.
However, it is somewhat disconcerting that there seems to be so few younger folk who are interested and active in the post-industrial underground - and I mean those who really 'get it' and have strong ideas of the their own to carry the torch forwards. There are clear exceptions to that, such as the Fieldwork label and associated projects, but it has been silence from those quarters in the last few years.
But I am also glad to hear that Noise Receptor is useful some to find out about new stuff - as that is its role.
