The popular picture-sharing empire behind I Can Has Cheezburger lets you view, caption and share funny images. You can do this via its sites and, the now, thanks to their API, you can do it via code (technical details at our Cheezburger API profile).
Swivel, along with its cousin IBM Research's Many Eyes, is helping make sharing, visualizing, and discussing data on the web fun and addictive. How? Take, for example, the following Swivel-hosted graph, which shows the Growth of Creative Commons Photos on Flickr to millions of photos.