Sharing economy practices have become increasingly popular in the past years. From swapping systems, network transportation to private kitchens, sharing with strangers appears to be the new urban trend. Although Uber, Airbnb, and other online platforms have democratized the access to a number of services and facilities, multiple concerns have been raised as to the public safety, health and limited liability of these sharing economy practices. In addition, these innovative activities have been contested by professionals offering similar services that claim that sharing economy is opening the door to unfair competition. Regulators are at crossroads: on the one hand, innovation in sharing economy should not be stifled by excessive and outdated regulation; on the other, there is a real need to protect the users of these services from fraud, liability and unskilled service providers. This dilemma is far more complex than it seems since regulators are confronted here with an array of challenging questions: firstly, can these sharing economy practices be qualified as "innovations" worth protecting and encouraging? Secondly, should the regulation of these practices serve the same goals as the existing rules for the equivalent commercial services (e.g. taxi regulations)? Thirdly, how can regulation keep up with the evolving nature of these innovative practices? All these questions, come down to one simple problem: too little is known about the most socially effective ways of consistently regulating and promoting innovation.