I think good old RSS has a lot of potential as a malleable system component or backbone. RSS = message queue subscription protocol.
You can choose your app to consume RSS, then transform other content on the web into RSS feeds using various services. E.g. twitter posts -> RSS. If RSS goes beyond blogs it could be great. Could pageduty be replaced with an RSS feed, for example? Or even Email/SMS to some extent? Email is "expensive" to deliver in bulk (see Amazon SES etc.) but I wonder if an API for "people" delivered to them via RSS would provide a nice alternative with people releasing one-time tokens to avoid spam, and then making delivering a message to a bunch of people practically free like it should be.
You can choose your app to consume RSS, then transform other content on the web into RSS feeds using various services. E.g. twitter posts -> RSS. If RSS goes beyond blogs it could be great. Could pageduty be replaced with an RSS feed, for example? Or even Email/SMS to some extent? Email is "expensive" to deliver in bulk (see Amazon SES etc.) but I wonder if an API for "people" delivered to them via RSS would provide a nice alternative with people releasing one-time tokens to avoid spam, and then making delivering a message to a bunch of people practically free like it should be.