Interesting Information

When something happens, announce it.

If a service now or later would listen to it, then it is interesting.

Example

Say we are Facebook now. Let’s consider that an arbitrary user Jessie adds another user James. Then we expect that James is notified that Jessie wants to add him. That information is only interesting to James.

However! When James confirms that request, they become friends. Now this is interesting information to many parties. Jessie’s friends, James’s friends get a new entry on their feed. But that’s not where the story ends…

Now some services get this interesting information, “Jessie and James are friends as of {now}”. Suppose one of these services is a friendship recommendation calculator. It then does some proprietary magic and comes up with a list of people to recommend.

At any moment, we can decide to throw another service that listens to this kind of interest.