@zalandocalrissian I proposed email/mailing lists and had to explain what that was.
Haven't used it myself, but what about diaspora/friendica? Do they want facebook because of the features or because they already have an account there and your interactions within the group will blend into the rest of their facebook content seamlessly? If it's the latter, you won't find a tool that will satisfy them unless you convince them why facebook is evil and that that's a legitimate reason for you not to use it.
@zalandocalrissian I think it's because they're already used to it. You're right, there isn't a technical solution. Seems I'm stuck with Facebook.
mastodonten.de ist eine Mastodon Instanz offen für alle netten Leute (über 16).
Geht gut miteinander um (und lest die Regeln wenn ihr euch nicht sicher seid, was das heißt). Wer möchte, kann auch gerne etwas spenden, um den Betrieb von mastodonten.de zu unterstützen.
mastodonten.de is a Mastodon instance open to nice people (over 16). Be excellent to each other (and read the rules if you're not sure what that means). Who would like, can donate something, in order to support the operation of mastodonten.de.