birthdays

 birthdays  is a feature on some social media silos that shows a summary view of others birthdays for today, recently, or soon, sometimes with how old they are, and UI to interact with them, sometimes with a daily notification of whose / how many people's birthday it is.

Facebook

 * https://www.facebook.com/events/birthdays/ (needs screenshot).
 * page of people with current birthdays (today, recently, or soon)


 * Notification: "Name-of-person and 3 others have birthdays today. Send them good thoughts!"
 * needs screenshot

Brainstorming
How could "birthdays" work in an indieweb way?

Reader Feature
Is a birthdays summary view a (special) reader feature (since you're already following people)?

Microsub Client
or a separate mini indieweb app that subscribes to your Microsub endpoint and just shows a birthdays view to interact with?