Currently, the whole Rocket.Chat instance is a grain. However, it would be "more Sandstorm-y" if each channel were a separate grain. For that to work well, tho

Currently, the whole Rocket.Chat instance is a grain. However, it would be "more Sandstorm-y" if each channel were a separate grain. For that to work well, though, we need some UI features to emulate what Rocket.Chat already does internally: * The ability for grains to highlight themselves in the sidebar when there is activity or when you've been mentioned, so that you know to check them. This API actually just launched last week! So now the apps are being updated to use it. * Some way to create "private message" grains between two people. We haven't done this yet but we have some ideas. Soon, I hope to see Rocket.Chat add a "single-channel grain" mode where its own sidebar is removed and it relies on Sandstorm's sidebar. This would provide better security for channels which should only be accessible to a subset of people. Probably, the multi-channel mode will stick around too, for cases where you want the same people to have access to many channels.