Matrix. It's very secure and allows you to view several group chats/topics at once, and you can video/audio call through the Jira app extension.
Privacy Guides
In the digital age, protecting your personal information might seem like an impossible task. We’re here to help.
This is a community for sharing news about privacy, posting information about cool privacy tools and services, and getting advice about your privacy journey.
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This community is the "official" Privacy Guides community on Lemmy, which can be verified here. Other "Privacy Guides" communities on other Lemmy servers are not moderated by this team or associated with the website.
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Additional Resources:
- EFF: Surveillance Self-Defense
- Consumer Reports Security Planner
- Jonah Aragon (YouTube)
- r/Privacy
- Big Ass Data Broker Opt-Out List
Does it also offer features to pin important files/messages?
No but the most conversed topics stay at the top of the feed. Also my bad, it's now called Element in the app store, I forgot about the change.
Actually yes, but it's experimental feature. In Element (one of matrix clients) you have to enable it in "Labs" tab to use it.
Ohh that I didn't know.
I would challenge "very secure" but it is more than secure enough for this usecase.
Can you self-host, or are you looking for another online service? Facebook Groups is basically a forum when it comes down to it, and any forum software can do what you're asking. I really like Discourse. You can self-host it for free (well, whatever your server costs), they'll host it for free if you're an open-source project, or if you're a legal non-profit you can get 50% off their hosting for $25-50/month.
Ehhh unfortunately I don't think there is a good post-style alternative. Probably your best bet is a Discord-style multi-group-chat system like Revolt or possibly Matrix Element.