Ask HN: Centralized or Federated RSS notification services?

Twitter has been used for several years to publish alerts of various kinds, such as SaaS status (e.g. Slack). With Twitter's quality down the toilet, are there any central or federated RSS notification services that can fill this niche? I've only used RSS notifications in the context of individual clients, such as Outlook or Thunderbird, but would be helpful if there were a service like "SubscribeMe" where I could see notifications as they came online. Adding social commenting functionality would make it a twitter clone maybe, but really just looking for the notification service.