Cluster might suit your needs. It's not photo storage, but it's photo/video sharing that's only to private groups of people. In fact, people can't even know wha

Cluster might suit your needs. It's not photo storage, but it's photo/video sharing that's only to private groups of people. In fact, people can't even know what other clusters you belong to, other than the ones they share with you. Works on the web at https://cluster.co https://cluster.co and it's on iOS and Android. Disclaimer: I'm the iOS developer on Cluster. As always, feedback appreciated if you do check it out.