Almost every single piece of popular social software is built on limitations. In fact, their models are almost all exclusively made up of boundaries that box in a certain measurable behavior.

AOL -> Myspace -> Facebook -> Twitter -> Pinterest -> Vine or whatever comes next has always been a dialog of editorializing and limiting communication into models that are smaller and easier for digital communication.

The problem with the internet was different that any other communication technology of the last thousand years. Unlike books, phones or even TV, it provided too much access and too vast an audience with boundless communication (i.e. AOL Mass chatrooms) and people felt lost and faceless in the masses. Social media has been an exercise in limitation to solve that problem since its inception.

lets do it! I'll go first: How about a chat program based on sharing websites? Or an email program without a subject line?