Tweet RPG is a free online game that allows you to play through Twitter. I must admit the concept is not that easy for me to grasp, so I was very happy to chat with Samuel so he could explain everything!
From the Tweet RPG website:
Tweet RPG is a free online role-playing experience, which utilises Twitter to provide users with an innovative new way of enjoying text-based adventures. The twist with Tweet RPG is that you aren’t the only one making the decisions; everyone playing has a chance to shape the story. Tweet RPG followers can cast their votes as to how the current adventure should unfold, with the majority choice leading the way.