Photo sharing is a favorite hobby of ours at home. My kids and I love to make musical slideshows of the family's "growing cousins". It's one thing to share home photos, but school photos are another thing. Due to the privacy issues with students, we must be careful when using photo sharing apps. However, witihin the school setting, there are many ways to benefit from photo sharing apps and websites. We can create slideshows for presentations, assemblies, moving up ceremonies, etc. I am currently working on a "Senior" slideshow for my daughter's class.
On my Ipad I tried working with Aviary but didn't have the results that I wanted. (I wanted to be able to do slideshows such as the ones you can do on Windows). I am still playing with it as an App, but I like Muzy much better.
For my library students I am currently assembling photos for our "Get caught Reading" photo showcase. Here are some of our photos I "pinned" on a corkboard using Muzy.
Muzy is great for making collages, posters, photo designs, etc. It is fairly easy to use and can be shared on most social networks.
Happy photo sharing! :)