[magnetic]

> I mean, I'd still think about that even without FB showing me things, but I would not have managed to build a "here's a flashback!" photo-reminder system.

You wouldn't have had to if you used macOS with the Photos app. Every once in a while it notifies me about a flashback, and if I click on the notification it takes me to a flashback slideshow in the Photos app.

I don't use iCloud for my photos, so I suspect this is implemented locally without having to give my data to Apple.

Maybe similar systems exist with other environments (linux, Windows, etc).