NodeBB

@iMeddles
For now it's single device, but we're working on multi-device support. Our approach is to handle sync through the relay rather than backups. Each phone would run its own server independently and receive activities from the relay, which could also store lightweight sync data like read positions.
@apps

@nikatjef
If a post is in safe mode, replies from non-compatible instances would simply be rejected. You can only reply to a safe mode post if your instance supports interaction controls. This way the entire thread stays protected by design.

@nyquildotorg
When delivering a post, Holos already knows which instances your followers are on. We'll start by validating compatible instances based on software type and version number. Over time, Holos will also build a local registry automatically by checking how instances actually respond to interaction requests.

In #ActivityPub, once a post is federated, you lose control over how remote instances handle interactions on it. Some servers like #GoToSocial are working on interaction controls, but non-compatible instances simply ignore your rules.
With #HolosSocial, we're considering a "safe mode" available at publishing time. Your post would only be delivered to followers on instances that respect interaction controls. Not enabled by default, but there for those who need it.