There’s a happy little community of Ex ADN-ers off on Mastodon, resolved to (at this stage & hopefully always) be invite-only.
That said, if any of you former ADN folk would like to play in a new sand-pit, here’s an invitation: https://appdot.net/invite/XShQcFMV
@henry, who started it up prefers to refer to appdot.net as “app double-dot net.” A few users have abbreviated that to ADDN.