A distinctive feature of recent revolutions was the key role of social media (e.g. Facebook, Twitter and YouTube). We study the role of social media in mobilization. In a simple model we assume that while social media allow to observe all previous decisions, mass media only give aggregate...

Recently, the disruptive impact of blockchain technology on the digital advertising industry has caught widespread attention. However, advertisers are uncertain of whether to adopt the blockchain, and it is unclear how publishers would allocate their spots facing this new technology. Although...