Privacy. Friend of mine travels all over the world. He wants to keep track of where he's been, which photographs he took in which locations, what he did there.

Privacy. Friend of mine travels all over the world. He wants to keep track of where he's been, which photographs he took in which locations, what he did there. He doesn't want to have to share all of that with everybody. It's just for him, so that he can remember and reminisce. There are wonderful, powerful web apps for this purpose, and many others. But they make him share it all. Social functions are primary. Private apps where you can do what you want are becoming niche.