There are things that need prototypes. You can mock a bit, write about it, but if it works you can sometimes only find out in practice. How would you build a

There are things that need prototypes. You can mock a bit, write about it, but if it works you can sometimes only find out in practice. How would you build a minimal tic-tok competing with insta stories and snapchat? Surely not with youtube playlists or something. Or dropbox: usb-drives in ubers?