Very nice words, Urs, thank you! 
You have to do both:
- Forum (there are people who got to know the Austrian Fairphoners through the forum, and the meetups originated here, when @EvaS needed help with her display repair; read the first 10 posts in Austrian Fairphoners
) - Facebook (Great to easily create an event and invite your friends and family)
- and more. I have, for example, prepared some Fairphone stickers with our contact information, which I give to Fairphone-owners I meet in the street, or lay out at befriended events:
https://pbs.twimg.com/media/CO8PHTcWoAApLc6.jpg
I don’t think this is confidential, as @anon30133089 told me this yesterday at the Vienna meetup: Apparently Fairphone is working on a Fairphoners map where everyone can pin a needle and share their location (something similar to the Local Fairphoners Address Book Map, but open to everyone’s submission).
What I’d like to have is a shortlink to forum posts (e.g. Home | Fairphone or Vienna Event: "Twentytwenty" Recap - Fairphone) or a micropage for local Fairphoner groups (kind of like the “very basic organizing tool”, you propose).
PS.: From the beginning I was thinking about a European Fairphoners Meetup (this is from the original post in Austrian Fairphoners):
Thinking about it: We should definitely do this! 
Yesterday we were joking about doing a community trip (maybe in the summer holidays) to Amsterdam to visit Fairphone. 
Actually it is not something that’d be impossible… 