Thanks. I meant more with respect to users spamming forums - to send a message to a particular forum do I just have to know of its existence? Or is it that each user only sees messages from its contacts on each forum?
A Briar user can either create a new forum, or get invited via a Briar contact that is already in an existing forum. There's some more info on this topic in Briar's user manual if you're interested: https://briarproject.org/manual/
Briar also has the ability to introduce contacts to each other, so while it doesn't support totally public forums, you can spread information between contacts fairly effectively.
