@932876d5 I've always wanted a family tree photo app, for family reunions where I have no idea who the heck I'm talking to. 

* Long press on a photo: see other photos of the same person, or add a new photo you take there.
* Swipe left or right: cycle through siblings
* Swipe up: see parents of current photo, tap to select
* Swipe down: see children and spouse of current photo, tap to select

Can also work for org charts (like in a corporate retreat, or a large staff/particpant multi-day training course, etc.). Basically, anywhere that there's at least some structure and lots of people you need to keep track of. 

 @2b551daa Ooh this is very interesting! I'll have a think