You can enable default federation in the admin panel, which has several lists of pre-configured instances and filters focused on topics like crypto, privacy, tech, or politics. By default, your instance checks these lists once an hour for "rising" posts and comments. You can also enable custom federation links, which can include other Spasm instances as well as regular RSS feeds, since Spasm's agnostic architecture supports various protocols, private keys, and even unsigned legacy RSS posts. Custom federation allows you to use different filters and update frequencies for each source. The custom federation list is public, so you can see an example at this instance, which has a lot of RSS sources: https://degenrocket.space/admin If you want to keep your federation list hidden, then you can configure it through an environment variable.