Instagram is on Android with support for Facebook Twitter, Tumblr, and Foursquare but not Flickr. Increasingly, pictures are being shared due to the proliferation of websites like pinterest. It is a free app and a great way to share photographs from your phone.
Withings is a company that has wi-fi enabled devices. These devices include apps and all kinds of smart-enabled tools (including ifttt.com integration.) Scales can automatically log your weight to evernote or a google doc to track, a blood pressure monitor and perhaps my favorite, a baby monitor that lets you dial in on junior using your iphone or ipad. (I needed that when my children were younger.) I am thinking about getting the baby monitor to use to monitor my classroom. So many different applications.
My students and I have been playing with Aurasma today on our ipads and iphones. You have to have a unique image (digital or distinct images are best) and you can attach animations or videos to them. So, a book's page can have a video attached or a painting could have a description attached. It is very cool. This TED video explains the concept.