Turns out Zoom actually runs on Linux in addition to Windows and Mac. But I'm still not a fan; I would run an audiovisual calling program that was FOSS as my first option or, if not that, using WWW standards.
@rjl20 I found Jitsi too; I might try it out. I don't know if my pals will chat on it though. Most run Discord which runs in WWW navigators, so I got that.
Mastodon is a "FOSS" social sharing hub. A multi-host substitution for capitalistic platforms, it avoids risking a particular company monopolizing your communication. Pick a host that you trust — you can still talk with all hosts running Mastadon. Any individual can run a Mastodon instantiation and join in this social hub in a jiffy.