The download button opens the iTunes App Store, where you may continue the download process. You must have iTunes installed with an active iTunes account in order to download and install the software. This download may not be available in some countries.
As long as there have been photographs, there has been sharing. Take a picture, get it developed or print it out, share it with others. As photos have gone digital, the process has remained the same, a straight line. Take a picture, share it with others, comment and connect.
Why do you share your photos, anyway? Because you want to, not because you need to. But there's one thing every photographer needs, from the seasoned pro to the eager beginner: You need an idea. A creative decision. A flash of inspiration. Every photo is a moment in time. It's ideas that capture those moments. While many of us see the same moments, we interpret them in our own ways. Wouldn't it be great if we could share not just the moments, but the inspiration that caught them? Wouldn't it be great to go social with your ideas, with your unique view of the world, as you create your photos?