Not only is Twitter a tightly networked circle of Chinese dissent, it is also a direct line to the foreign media. It thus can be an effective way for Chinese to send an SOS signal to the outside world. Several years ago, blogger Peter Guo famously declared that Twitter helped get him out of jail. He got in trouble for spreading word about a crime that allegedly involved local officials. After he was arrested, he tweeted for help via his mobile phone. His case quickly attracted domestic and international attention, and he was released a couple of weeks later.