Naven
Communities
An alumni group people can find again
Nobody has everybody's current number, which is exactly the situation a link-joined space is for.
Who this is for
School and university year groups reconnecting years later.
How it is usually set up
A channel with a link that can be posted where the year group already gathers.
What Naven does not claim
Naven promises no security and no moderation. Messages are screened before they send against twelve published categories, by software written by one person — it misses things, and it is weaker in languages other than English. Calls are not screened at all. Naven is not end-to-end encrypted, which is what makes screening possible; anyone whose first requirement is end-to-end encryption should use Signal.
What it costs
Nothing. Naven is free, with no advertising, no paid tier and no data sale.