When Twitter started to become popular, I remember thinking that the premise of its service, that its distinguishing feature was its limitation, was ridiculous. (Remember never to ask me for investment advice.)
At the time, I thought that it would be really fun to create a parody site where you could only post one bit messages. Clearly, the site would be called bitter, and when you log in the prompt would ask “Are you bitter?” and if you answered yes your post would be a frowny face, while if you answered no your post would be a smiley face. I went as far as checking that this didn’t seem too hard to pull off in Drupal, to make sure no such parody site existed already, and to see if bittr.com or bittr.net were available. (Of course they weren’t!)
Anyways, I was mistaken in thinking that two possible messages, and hence one bit of information, was the end of the road. Indeed, it is possible to have only one possible message, and this is the insight pursued by yo, which, apparently, is not a parody and has received one million dollars in funding.