I started the 30 day process of deleting my Facebook account yesterday. I think I've weaned myself from the platform (I was mainly a lurker in the past) but we'll see, maybe I'll go crawling back. Google Plus goes away next month. I haven't really posted to either platform in a long time. I suspect the idea of creating content for those ecosystems was part of the disincentive.
I've causally looked at Mastodon and Diaspora over the years but never very seriously.
Maybe I'll get back into writing every once and again on my blog. The WordPress editing UI is pretty good these days. We'll see, maybe this'll be one of those posts followed by nothing for years, hopefully not.