Hacker News on 21 January 2012

• Two things about SOPA/PIPA and then I'll shut up
• MPAA Publicly Threatens to Stop Writing Checks
• How U.S. Lost Out on iPhone Work
• Investment Firm Y Combinator Goes on Offensive Against Hollywood
• Fields medalist Tim Gowers: Elsevier — my part in its downfall
• Can we kill the music business too?
• How Reddit went from a second-tier aggregator to the Web’s unstoppable force
• We are sorry to inform you
• The Secret Document That Transformed China
• Polish Internet community goes nuts against ACTA