This isn't a technically hard problem to solve, but it seems people have been chasing it for years without any strong uptake. I suspect this is something that

This isn't a technically hard problem to solve, but it seems people have been chasing it for years without any strong uptake. I suspect this is something that will have to be 'built-in' to the OS, and ideally some cross-platform protocol compatibility, before it ever becomes a 'standard' (assuming it does). I worked with a startup for a while on a couple variations of this problem, and it's very much a classic chicken and egg problem. The angle that I was a bit more intrigued with taking was not about 'friends', and more just about the geo part. In other words, having your pics be available publicly by geo info. This conflicted a lot with the use cases of "share party pics with family/friends", but it seems there's dozens of ways to do that (facebook has a whole separate dedicated app that, to this day, few people I know knows about, but they all use facebook).