The problem with having photos spread out across various services and apps is that you're often forced to bounce between them in order to find a particular photo.
YoVivo is new app that's throwing its hat in the ring as a one-stop shop for all of your photo needs. Within the app, you can access photos stored in a long list of services, including Facebook, Twitter, Instagram, Dropbox and Flickr to name a few.
Of course you can also view the photos stored on your iOS device, though I've had some trouble accessing photos stored in my iCloud Photo Library. Your results may vary.
Additionally, you can create and share slideshows from within the app with just a few taps.
Perhaps the most interesting aspect of the app is its encryption feature. From within the app you can share photos across networks and services, either in a traditional form or in encrypted format. This allows you to securely share your most private photos without worrying about someone accessing them without your OK.