China's Internet has changed fundamentally since Shi Tao was given a 10-year prison sentence in 2005. Shi's case was a marker of sorts--- the first high profile sentencing in China for online activity. The government says 40 percent of the population is online as of December 2012. That's 564 million people. In 2005, penetration was 8.5 per cent. Shi was detained in 2004 and sentenced on charges of "leaking state secrets abroad" for messages he wrote summarizing government restrictions on domestic media reporting on the 15th anniversary of the Tiananmen Square massacre. He used his Yahoo email account to post anonymous messages on a US-based pro-democracy forum. His unexpected release from prison on August 23 was announced Saturday in a statement from PEN International, an organization of writers.