One of the most exciting outcomes from the Federated Social Web Summit in July was the formulation of the Social Web Acid Test - Level 0 (or SWAT0). As an excited group of developers eager to build a decentralized social web, we gave ourselves a deadline of September 30th, 2010 to implement a first basic usage scenario. The use case includes a mix of following, mentions, replies - the kind of actions we are accustomed to on current social networks - happening across three separate social networks. For full details, see the SWAT0 description.