So the question is where will that userbase go, now might be the time to position yourself to accept them if you're a similar site .. I probably wouldn't be here [on HN] if Slashdot/Digg/etc. hadn't screwed up in the past.
- Twitter - Pillowfort - Wordpress - Mastodon
depends a lot on what the user was into posting.
I'm also seeing quite a few more people operating on multiple sites at once now, even SFW blogs. So they'll post Tumblr, Pillowfort, and Wordpress at the same time so their former users can still see them.