The product just works so much better than the rest in terms of the social mechanics + natural flow of user interaction. You could have asked the same thing of

The product just works so much better than the rest in terms of the social mechanics + natural flow of user interaction. You could have asked the same thing of what does dropbox do that box.net, xdrive, (insert 10 million others),etc. do better? Dropbox just works so much better that once you experience it, you'll certainly agree. I was an early user of Vark and I loved their product in the early days, but once the floodgates opened, I think the way it was used didn't logically scale. I was getting lots of random ims + unrelated questions.