ZupStream is a service where real friends share, discover, and organize real-world activities. Users express intentions, aspirations, and opportunities to do things. In ZupStream, friends share what they are up to and up for tonight, tomorrow, this weekend, or whenever. They can also explore crowdsourced activity ideas for inspiration. ZupStream combines aspects of Twitter and Facebook, but focuses on upcoming activities. The definition and details of an activity can evolve from a simple idea.